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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other noncurrent liabilities $ 3,484 $ 7,043
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total debt 362,625 415,561
Estimate of Fair Value Measurement [Member] | Phantom Share Units (PSUs) [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Value 5,100 6,100
Estimate of Fair Value Measurement [Member] | Senior Notes [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total debt 186,750 243,948
Estimate of Fair Value Measurement [Member] | Term Loan [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total debt 175,875 171,613
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total debt 464,552 461,665
Reported Value Measurement [Member] | Phantom Share Units (PSUs) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other Liabilities 3,600  
Other noncurrent liabilities   3,600
Reported Value Measurement [Member] | Senior Notes [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total debt 296,988 296,181
Reported Value Measurement [Member] | Term Loan [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total debt $ 167,564 $ 165,484