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Long-term Debt (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) Rate | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |
Unamortized deferred loan costs | $ | $ 12,071 | $ 12,787
Long-term Debt | $ | 565,929 | $ 575,213
Contractual Quarterly Payments | $ | $ 2,100 |
Leverage Ratio | 1.80 |
$825 Million Term B Loan Facility, due June 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | $ | $ 825,000 |
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Leverage Ratio in Latest Year of Debt Term | 3.25 |
Leverage Ratio | 3.75 |
Notes Payable to Banks [Member] | Minimum [Member] | $200 Million Revolving Credit Facility, Due February 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Basis Spread on Variable Rate | 0.25% |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.20% |
Notes Payable to Banks [Member] | Minimum [Member] | Eurodollar [Member] | $200 Million Revolving Credit Facility, Due February 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25% |
Notes Payable to Banks [Member] | Maximum [Member] | $200 Million Revolving Credit Facility, Due February 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Basis Spread on Variable Rate | 1.25% |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.35% |
Notes Payable to Banks [Member] | Maximum [Member] | Eurodollar [Member] | $825 Million Term B Loan Facility, due June 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Basis Spread on Variable Rate | 2.00% |
Notes Payable to Banks [Member] | Maximum [Member] | Eurodollar [Member] | $200 Million Revolving Credit Facility, Due February 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Basis Spread on Variable Rate | 2.25% |
$200 Million Revolving Credit Facility, Due February 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ | $ 195,700 |

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