Quarterly report pursuant to Section 13 or 15(d)

Debt - Credit Facility (Details)

v3.3.0.814
Debt - Credit Facility (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
quarter
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
Debt Instrument [Line Items]        
Prepayments of long-term debt   $ 40,000,000 $ 0 $ 50,600,000
Revolving credit facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 500,000,000      
Annual commitment fee on daily undrawn balance of revolving credit facility   0.15%    
Revolving credit facility | Minimum        
Debt Instrument [Line Items]        
Annual commitment fee on daily undrawn balance of revolving credit facility   0.10%    
Revolving credit facility | Maximum        
Debt Instrument [Line Items]        
Annual commitment fee on daily undrawn balance of revolving credit facility   0.25%    
Term loans and revolving credit facility        
Debt Instrument [Line Items]        
Number of consecutive quarters required to maintain ratio | quarter   4    
Minimum interest expense coverage ratio   3.50    
Credit facility, amount outstanding   $ 0   $ 0
Term loans and revolving credit facility | Covenant Compliance Period 1        
Debt Instrument [Line Items]        
Number of consecutive quarters required to maintain ratio | quarter   4    
Term loans and revolving credit facility | September 30, 2015 and December 31, 2015        
Debt Instrument [Line Items]        
Maximum leverage ratio   4.00    
Term loans and revolving credit facility | March 31, 2016 through September 30, 2016        
Debt Instrument [Line Items]        
Maximum leverage ratio   3.75    
Term loans and revolving credit facility | December 31, 2016 and March 31, 2017        
Debt Instrument [Line Items]        
Maximum leverage ratio   3.50    
Term loans and revolving credit facility | Thereafter        
Debt Instrument [Line Items]        
Maximum leverage ratio   3.00    
Term loans and revolving credit facility | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.25%    
Term loans and revolving credit facility | LIBOR | Minimum        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.00%    
Term loans and revolving credit facility | LIBOR | Maximum        
Debt Instrument [Line Items]        
Basis spread on variable rate   1.75%    
Term Loans        
Debt Instrument [Line Items]        
Principal amount $ 750,000,000      
Term of debt instrument 5 years      
Early repayment of senior debt   $ 40,000,000    
Term Loans | September 30, 2015 through December 31, 2016        
Debt Instrument [Line Items]        
Periodic principal payment   9,375,000    
Term Loans | March 31, 2017 through December 31, 2017        
Debt Instrument [Line Items]        
Periodic principal payment   14,063,000    
Term Loans | March 31, 2018 through September 30, 2019        
Debt Instrument [Line Items]        
Periodic principal payment   18,750,000    
Term Loans | December 31, 2019        
Debt Instrument [Line Items]        
Periodic principal payment   $ 487,500,000