Annual report pursuant to Section 13 and 15(d)

Long-term Debt (Details)

v3.6.0.2
Long-term Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 13, 2016
Dec. 31, 2016
Dec. 31, 2015
Nov. 10, 2014
Long-term debt        
Net unamortized debt issuance costs   $ (10,086)    
Long-term debt, net   849,914 $ 620,000  
Revolving credit facility        
Long-term debt        
Long-term debt   210,000 620,000  
Maximum amount of the Credit Facility       $ 1,500,000
Outstanding balance   $ 210,000 $ 620,000  
Weighted average interest rate (as a percent)   2.23% 1.92%  
Letter of credit        
Long-term debt        
Current borrowing capacity       $ 150,000
Outstanding balance   $ 0 $ 0  
Letter of credit | Minimum        
Long-term debt        
Commitment fees on the unused portion (as a percent)   0.25%    
Letter of credit | Maximum        
Long-term debt        
Commitment fees on the unused portion (as a percent)   0.375%    
5.375% Senior Notes due 2024        
Long-term debt        
Long-term debt   $ 650,000    
Face amount $ 650,000      
Interest rate (as a percent) 5.375%      
Debt instrument redemption percentage upon change of control 101.00%      
5.375% Senior Notes due 2024 | Prior to September 15, 2019        
Long-term debt        
Debt instrument redemption percentage 105.375%      
Debt instrument redemption percentage with payment of premium and interest 100.00%      
5.375% Senior Notes due 2024 | Prior to September 15, 2019 | Maximum        
Long-term debt        
Percent of aggregate principal amount that can be redeemed 35.00%      
5.375% Senior Notes due 2024 | On or after September 15, 2019        
Long-term debt        
Debt instrument redemption percentage 104.031%      
5.375% Senior Notes due 2024 | On or after September 15, 2022        
Long-term debt        
Debt instrument redemption percentage 100.00%