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Long-Term Debt (Details) $ in Thousands |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 22, 2017 Rate | Aug. 22, 2017 Rate | Feb. 21, 2017 USD ($) Rate | Aug. 05, 2016 Rate | Dec. 31, 2017 USD ($) Rate | Dec. 31, 2016 USD ($) | Jun. 05, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Secured Debt |  |  |  |  | $ 588,000 | $ 656,000 |
Unamortized Debt Issuance Expense |  |  |  |  | (12,787) | (15,645) |
Long-term Debt |  |  |  |  | 575,213 | 640,355 |
Creditfacilityamendmentcosts |  |  |  |  | $ 3,300 | 900 |
Line of Credit Facility, Interest Rate at Period End | Rate |  |  |  |  | 3.57% |  |
Contractual Quarterly Payments |  |  |  |  |  |  | $ 2,100
Leverage ratio |  |  |  |  | 1.89 |  |
Letters of Credit Outstanding, Amount |  |  |  |  | $ 4,400 | 4,000 |
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 | 0 |
Face amount of term loan |  |  |  |  |  |  | 150,000
$825 Million Term B Loan Facility, due June 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Secured Debt |  |  |  |  | 588,000 | $ 656,000 |
Face amount of term loan |  |  |  |  |  |  | $ 825,000
$200 Million Revolving Credit Facility, Due February 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount of term loan |  |  | $ 200,000 |  |  |  |
Term Loan Facility | $825 Million Term B Loan Facility, due June 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate borrowings | Rate |  | 0.25% | 0.50% | 0.25% |  |  |
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 |  | 2.00% |  |  |  |  |
Term Loan Facility | $200 Million Revolving Credit Facility, Due February 2022 [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate borrowings | Rate | 0.50% |  |  |  |  |  |
Term Loan Facility | $200 Million Revolving Credit Facility, Due February 2022 [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate borrowings | Rate | 1.25% |  |  |  |  |  |
Revolving credit facility, unused portion, commitment fee percentage | Rate | 0.35% |  |  |  |  |  |
Term Loan Facility | $200 Million Revolving Credit Facility, Due February 2022 [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate borrowings | Rate | 0.25% |  |  |  |  |  |
Revolving credit facility, unused portion, commitment fee percentage | Rate | 0.20% |  |  |  |  |  |
LineofCreditFacilityUnusedCapacityReductioninCommitmentFee | Rate | 0.05% |  |  |  |  |  |
Term Loan Facility | $200 Million Revolving Credit Facility, Due February 2022 [Member] | Eurodollar [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate borrowings | Rate | 2.25% |  |  |  |  |  |
Term Loan Facility | $200 Million Revolving Credit Facility, Due February 2022 [Member] | Eurodollar [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate borrowings | Rate | 1.25% |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  |  | 195,600 |  |
Interest Expense [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Creditfacilityamendmentcosts |  |  |  |  | $ 2,700 |  |

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