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Debt - 5% Convertible Senior Note Due 2021 (Details) |  |  | 1 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 27, 2016 USD ($) shares | Jun. 21, 2016 USD ($) $ / shares | Jun. 30, 2016 USD ($) trading_day day | Dec. 31, 2019 USD ($) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 15, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  |  |  |  | $ 241,336,000 | $ 118,751,000 | $ 603,770,000 |
Principal amount of long-term debt |  |  |  | $ 634,737,000 | 634,737,000 | 416,466,000 |  |
Unamortized discount (premium) and debt issuance costs |  |  |  | $ 22,806,000 | $ 22,806,000 | 23,826,000 |  |
5% Convertible Senior Notes due 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  | 5.00% | 5.00% | 5.00% |  |  |
Convertible Debt | 5% Convertible Senior Notes due 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 115,000,000 |  |  |  |  |
Additional principal amount |  |  | 15,000,000 |  |  |  |  |
Proceeds from borrowings |  |  | $ 111,600,000 |  |  |  |  |
Unamortized discount and debt issuance costs, percentage |  |  | 3.00% |  |  |  |  |
Debt instrument, interest rate |  |  |  | 5.00% | 5.00% |  |  |
Conversion rate | 55.5556 |  |  |  |  |  |  |
Number of equity instruments (in shares) | shares | 6,388,894 |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | $ 18.00 |  |  |  |  |  |
Threshold percentage of stock price trigger | 140.00% |  |  |  |  |  |  |
Threshold trading days | day |  |  | 20 |  |  |  |  |
Threshold consecutive trading days | trading_day |  |  | 30 |  |  |  |  |
Redemption price, percentage | 100.00% |  |  |  |  |  |  |
Repurchase face amount |  |  |  | $ 66,300,000 | $ 66,300,000 |  |  |
Repayments of convertible debt |  |  |  | $ 18,600,000 |  |  |  |
Issuance of common stock for convertible notes repurchase, net (in shares) | shares |  |  |  | 3,200,000 |  |  |  |
Repurchase of convertible debt |  |  |  | $ 74,300,000 |  |  |  |
Debt extinguishment and commitment costs |  |  |  |  | (6,100,000) |  |  |
Long-term debt, fair value | $ 89,300,000 |  |  |  |  |  |  |
Carrying amount of equity component | 22,200,000 |  |  | 28,700,000 | 28,700,000 |  |  |
If-converted value in excess of principal |  |  |  |  | 14,200,000 |  |  |
Principal amount of long-term debt |  |  |  | 48,665,000 | 48,665,000 | $ 115,000,000 |  |
Unamortized discount (premium) and debt issuance costs |  |  |  | 3,900,000 | 3,900,000 |  |  |
Term Loan | Tranche B Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of debt |  | $ 5,000,000 |  |  |  |  |  |
Deferred finance costs, net |  |  |  |  |  |  |  | $ 2,500,000
Long-term Debt | Convertible Debt | 5% Convertible Senior Notes due 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Deferred finance costs, net | $ 600,000 |  |  |  |  |  |  |
Reported Value Measurement | 5% Convertible Senior Notes due 2021 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, fair value |  |  |  | $ 44,800,000 | $ 44,800,000 |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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