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Debt - Exchangeable Senior Notes (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Aug. 31, 2014 USD ($) $ / shares
Debt Instrument [Line Items] |  |  |  |  |
Amortization of deferred financing costs | $ 1,000,000 | $ 1,300,000 | $ 2,000,000 | $ 2,600,000 |
Convertible debt | Exchangeable Senior Notes due August 15, 2019 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  |  |  | $ 250,000,000.0
Stated rate (as a percent) | 2.63% |  | 2.63% |  | 2.625%
Shares converted (in shares) |  |  | 0.0518215 |  |
Conversion price (in USD per share) | $ / shares |  |  |  |  | $ 19.27
Debt interest expense | $ 2,500,000 | 2,500,000 | $ 4,900,000 |  |
Contractual interest expense | 1,700,000 | 1,700,000 | 3,300,000 |  |
Accretion of debt discount | 600,000 | 600,000 | 1,300,000 |  |
Amortization of deferred financing costs | $ 200,000 | $ 200,000 | $ 300,000 | $ 300,000 |

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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=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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