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Long-Term Debt (Details) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 21, 2017 Rate | Dec. 31, 2016 USD ($) Rate | Dec. 31, 2015 USD ($) | Jun. 05, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |
Secured Debt |  | $ 656,000 | $ 774,000 |
Unamortized Debt Issuance Expense |  | (15,645) | (18,492) |
Long-term Debt |  | 640,355 | 755,508 |
Creditfacilityamendmentcosts |  | $ 900 |  |
Weighted average interest rate |  | 3.50% |  |
Contractual Quarterly Payments |  | $ 2,100 |  |
Leverage ratio |  | 2.32 |  |
Letters of Credit Outstanding, Amount |  | $ 4,000 | 3,500 |
Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Leverage ratio |  | 4.00 |  |
Leverage Ratio in Latest Year of Debt Term |  | 3.25 |  |
$825 Million Term B Loan Facility and $150 Million Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount of term loan |  |  |  | $ 975,000
$150 Million Revolving Credit Facility, Due June 2020 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured Debt |  | $ 0 | 50,000 |
Face amount of term loan |  |  |  | 150,000
$825 Million Term B Loan Facility, due June 2022 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Secured Debt |  | $ 656,000 | $ 724,000 |
Face amount of term loan |  |  |  | $ 825,000
Basis spread on variable rate borrowings | Rate | 0.50% |  |  |
Term Loan Facility | $150 Million Revolving Credit Facility, Due June 2020 [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate borrowings | Rate |  | 2.50% |  |
Revolving credit facility, unused portion, commitment fee percentage | Rate |  | 0.00% |  |
Term Loan Facility | $150 Million Revolving Credit Facility, Due June 2020 [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate borrowings | Rate |  | 0.75% |  |
Revolving credit facility, unused portion, commitment fee percentage | Rate |  | 0.00% |  |
Term Loan Facility | $825 Million Term B Loan Facility, due June 2022 [Member] | Minimum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate borrowings | Rate |  | 2500.00% |  |
Term Loan Facility | $825 Million Term B Loan Facility, due June 2022 [Member] | Eurodollar [Member] | Maximum [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate borrowings | Rate |  | 2.75% |  |
Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  | $ 146,000 |  |

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