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Long-Term Debt - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |
Total debt, net of unamortized loan fees | $ 728,012 |  | $ 728,012 |  | $ 770,242
Unamortized loan fees | $ 12,558 |  | $ 12,558 |  | $ 14,994
Effective rate | 3.63% |  | 3.63% |  |
Leverage ratio threshold |  |  | 2.25 |  |
Variable interest rate |  |  | 0.25% |  |
Cash paid for interest, net of amounts capitalized |  |  | $ 21,600 | $ 25,100 |
Term loan A-1 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Periodic payment of principal |  |  | 3,600 |  |
Periodic payment principal, period two |  |  | 7,300 |  |
Periodic payment principal, period three |  |  | $ 10,900 |  |
Term loan A-1 | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable interest rate |  |  | 1.50% |  |
Term loan A-2 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Periodic payment of principal |  |  | $ 1,200 |  |
Additional payment to required quarterly payments | $ 15,000 | $ 15,000 |  |  |
Term loan A-2 | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable interest rate |  |  | 1.75% |  |

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- Definition Amount after unamortized loan fees of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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