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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current maturities of long-term debt $ 0 $ (3,375)
Long-term debt (972,567) (1,022,004)
Carbon options contracts (d) 2,089 2,433
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 148,374 112,653
Restricted cash 8,080 59,703
Carrying Amount | Interest rate swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swaps 23,735 15,440
Carrying Amount | Carbon options    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carbon options contracts (d) (322) 0
Carrying Amount | Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current maturities of long-term debt 0 (3,375)
Long-term debt (972,567) (1,022,004)
Carrying Amount | Fair Value, Measurements, Recurring | Foreign currency exchange contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency contracts, liability (1,442)  
Foreign currency contracts, asset   2,807
Carrying Amount | Fair Value, Measurements, Recurring | Foreign currency option contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency contracts, asset 145 352
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 148,374 112,653
Restricted cash 8,080 59,703
Fair Value | Level 1 | Interest rate swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swaps 0 0
Fair Value | Level 1 | Carbon options    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carbon options contracts (d) 0 0
Fair Value | Level 1 | Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current maturities of long-term debt 0 0
Long-term debt 0 0
Fair Value | Level 1 | Fair Value, Measurements, Recurring | Foreign currency exchange contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency contracts, liability 0  
Foreign currency contracts, asset   0
Fair Value | Level 1 | Fair Value, Measurements, Recurring | Foreign currency option contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency contracts, asset 0 0
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Restricted cash 0 0
Fair Value | Level 2 | Interest rate swaps    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Interest rate swaps 23,735 15,440
Fair Value | Level 2 | Carbon options    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Carbon options contracts (d) (322) 0
Fair Value | Level 2 | Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Current maturities of long-term debt 0 (3,375)
Long-term debt (975,845) (1,030,135)
Fair Value | Level 2 | Fair Value, Measurements, Recurring | Foreign currency exchange contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency contracts, liability (1,442)  
Foreign currency contracts, asset   2,807
Fair Value | Level 2 | Fair Value, Measurements, Recurring | Foreign currency option contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Foreign currency contracts, asset $ 145 $ 352