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Debt - Senior Unsecured Notes Exchangeable (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Aug. 31, 2014
Debt Instrument [Line Items] |  |  |  |
Interest expense | $ 79,246,000 | $ 79,623,000 | $ 68,473,000 |
Amortization of deferred financing costs | $ 3,800,000 | 4,100,000 | 4,700,000 |
Senior unsecured notes - exchangeable | Senior unsecured notes - exchangeable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face amount |  |  |  | $ 250,000,000.0
Stated interest rate | 0.00% |  |  | 2.625%
Interest expense on note | $ 6,100,000 | 9,900,000 | 9,900,000 |
Interest expense | 4,100,000 | 6,600,000 | 6,600,000 |
Accretion of debt discount | 1,600,000 | 2,700,000 | 2,700,000 |
Amortization of deferred financing costs | $ 400,000 | $ 600,000 | $ 600,000 |

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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=118932676&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=116634182&loc=SL114868664-224227 + Details
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