Fair Value Measurements, Financial Instruments, and Credit Risk - Carrying Values and Approximate Fair Values of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Carrying Value | Significant Other Observable Inputs (Level 2) | ABL Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	$ 24,500	$ 5,000
Carrying Value | Significant Other Observable Inputs (Level 2) | Term Loan | USD Tranche
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	362,000	362,000
Carrying Value | Significant Other Observable Inputs (Level 2) | Term Loan | Euro Tranche
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	336,750	342,900
Carrying Value | Significant Other Observable Inputs (Level 2) | Capital lease obligation
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	1,143	1,184
Carrying Value | Quoted Prices in Active Markets for Identical Assets (Level 1) | Senior Notes | 7.0% Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	394,750	399,060
Carrying Value | Quoted Prices in Active Markets for Identical Assets (Level 1) | Senior Notes | 5.25% Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	325,524	331,470
Carrying Value | Significant Unobservable Inputs (Level 3) | KFPC Loan Agreement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	96,093	112,489
Carrying Value | Significant Unobservable Inputs (Level 3) | KFPC Revolving Facilities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	23,991	13,012
Fair Value | Significant Other Observable Inputs (Level 2) | ABL Facility
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	24,500	5,000
Fair Value | Significant Other Observable Inputs (Level 2) | Term Loan | USD Tranche
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	359,285	352,498
Fair Value | Significant Other Observable Inputs (Level 2) | Term Loan | Euro Tranche
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	336,541	338,830
Fair Value | Significant Other Observable Inputs (Level 2) | Capital lease obligation
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	1,143	1,184
Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) | Senior Notes | 7.0% Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	399,594	369,561
Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1) | Senior Notes | 5.25% Senior Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	331,553	299,125
Fair Value | Significant Unobservable Inputs (Level 3) | KFPC Loan Agreement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	96,093	112,489
Fair Value | Significant Unobservable Inputs (Level 3) | KFPC Revolving Facilities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt	$ 23,991	$ 13,012