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Debt - Senior Unsecured Notes (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Mar. 31, 2015 | Aug. 31, 2014
Debt Instrument [Line Items] |  |  |  |  |  |
Amortization of deferred financing costs | $ 1,500,000 | $ 1,400,000 | $ 3,900,000 | $ 2,500,000 |  |
Convertible Debt | Exchangeable Senior Notes due August 15, 2019 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated rate | 2.625% |  | 2.625% |  |  | 2.625%
Interest expense debt | $ 2,500,000 |  | $ 4,900,000 |  |  |
Contractual interest rate | 1,700,000 |  | 3,300,000 |  |  |
Accretion of debt discount | 600,000 |  | 1,300,000 |  |  |
Amortization of deferred financing costs | $ 200,000 |  | $ 300,000 |  |  |
Debt instrument face amount |  |  |  |  |  | $ 250,000,000.0
Senior Notes | Series A, Series B, and Series C Senior Unsecured Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument face amount |  |  |  |  | $ 350,000,000 |
Senior Notes | Series A Senior Notes due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated rate | 3.93% |  | 3.93% |  | 3.93% |
Debt instrument face amount |  |  |  |  | $ 100,000,000 |
Senior Notes | Series B Senior Notes due 2027 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated rate | 4.09% |  | 4.09% |  | 4.09% |
Debt instrument face amount |  |  |  |  | $ 125,000,000 |
Senior Notes | Series C Senior Notes due 2030 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated rate | 4.18% |  | 4.18% |  | 4.18% |
Debt instrument face amount |  |  |  |  | $ 125,000,000 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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