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Debt - Interest Expense and Other Debt Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Debt Instrument [Line Items]        
Interest expense, debt     $ 57,083 $ 53,460
Less capitalized interest     24 211
Interest expense $ 18,807 $ 18,042 57,059 53,249
Cash paid for interest     62,195 58,697
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Interest expense, debt     30,959 27,233
Senior Notes [Member] | 6% Senior notes        
Debt Instrument [Line Items]        
Interest expense, debt     22,500 22,500
Amortization discount and deferred debt issuance costs [Member]        
Debt Instrument [Line Items]        
Interest expense, debt     2,307 2,277
Commitment Fees and Other [Member]        
Debt Instrument [Line Items]        
Interest expense, debt     $ 1,317 $ 1,450