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Debt - Senior Unsecured Notes Exchangeable (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2014 USD ($) d $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |
Senior unsecured notes, net |  | $ 1,046,219,000 | $ 707,895,000 |
Interest expense |  | 79,623,000 | 68,473,000 | $ 70,595,000
Amortization of deferred financing costs |  | $ 4,100,000 | 4,700,000 | 5,000,000
Convertible Debt | Senior unsecured notes - exchangeable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount | $ 250,000,000 |  |  |
Stated interest rate | 2.625% | 2.625% |  |
Conversion price (USD per share) | $ / shares | $ 19.45 | $ 19.23 |  |
Debt, conversion ratio | 0.0514059 | 0.0520116 |  |
Percentage of principal amount redeemed | 100.00% |  |  |
Effective interest rate | 3.80% | 3.93% |  |
Senior unsecured notes, net | $ 236,600,000 |  |  |
Embedded conversion option |  | $ 13,400,000 | 13,400,000 |
Remaining discount amortization period | 5 years |  |  |
Unamortized discount |  | 1,600,000 | 4,300,000 |
Underwriting expense | $ 3,100,000 |  |  |
Deferred finance costs | $ 2,900,000 |  |  |
Embedded conversion feature, embedded |  | 200,000 | 200,000 |
Interest expense on note |  | 9,900,000 | 9,900,000 | 9,900,000
Interest expense |  | 6,600,000 | 6,600,000 | 6,600,000
Accretion of debt discount |  | 2,700,000 | 2,700,000 | 2,700,000
Amortization of deferred financing costs |  | $ 600,000 | $ 600,000 | $ 600,000
Covenant scenario one | Convertible Debt | Senior unsecured notes - exchangeable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Threshold percentage of stock price trigger | 130.00% |  |  |
Threshold trading days | d | 20 |  |  |
Threshold consecutive trading days | d | 30 |  |  |
Covenant scenario two | Convertible Debt | Senior unsecured notes - exchangeable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Threshold percentage of stock price trigger | 98.00% |  |  |
Threshold consecutive business days | 5 days |  |  |

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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + 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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