Long-Term Debt - Summary of Long-Term Debt (Details) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Debt Instrument [Line Items] | ||
| Long-term debt | $ 1,474,517 | |
| Capital lease obligations | 13,996 | $ 11,316 |
| Less: Unamortized debt issuance costs and discounts | (32,274) | (30,622) |
| Total debt | 1,442,243 | 1,255,359 |
| Less: Current maturities | 27,822 | 27,247 |
| Total long-term debt | 1,414,421 | 1,228,112 |
| Line of Credit | 2014 Revolver Loan | ||
| Debt Instrument [Line Items] | ||
| Long-term debt | 85,000 | 125,250 |
| Line of Credit | 2014 First Lien Term Loans | ||
| Debt Instrument [Line Items] | ||
| Long-term debt | 932,000 | 861,300 |
| Line of Credit | 2014 Second Lien Credit Agreement | ||
| Debt Instrument [Line Items] | ||
| Long-term debt | 0 | 246,500 |
| Senior Unsecured Notes | ||
| Debt Instrument [Line Items] | ||
| Long-term debt | 400,000 | 0 |
| Subordinated Notes | ||
| Debt Instrument [Line Items] | ||
| Long-term debt | 1,000 | 1,000 |
| Notes payable and secured loans | ||
| Debt Instrument [Line Items] | ||
| Long-term debt | $ 42,521 | $ 40,615 |