Long-Term Debt (Details) - Class of Stock [Domain]
$ / shares in Units, shares in Millions |
3 Months Ended |
6 Months Ended |
12 Months Ended |
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Jun. 30, 2015
USD ($)
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Mar. 31, 2015
USD ($)
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Jun. 30, 2014
USD ($)
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Mar. 31, 2011
USD ($)
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Jun. 30, 2015
USD ($)
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Jun. 30, 2014
USD ($)
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Jun. 30, 2012
USD ($)
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Dec. 31, 2012
USD ($)
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Dec. 31, 2011
USD ($)
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Mar. 11, 2015
USD ($)
$ / shares
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Mar. 09, 2015
shares
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Mar. 05, 2015
USD ($)
$ / shares
shares
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Dec. 31, 2014
USD ($)
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Apr. 04, 2011
USD ($)
$ / shares
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Mar. 30, 2011
shares
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Mar. 29, 2011
USD ($)
$ / shares
shares
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| Debt Instrument [Line Items] |
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| Interest Expense, Debt, Excluding Amortization |
$ 2,491,000
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$ 1,438,000
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$ 4,323,000
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$ 2,876,000
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| Accretion of Discount |
4,985,000
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2,255,000
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8,184,000
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4,434,000
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| Amortization of Financing Costs |
675,000
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326,000
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1,117,000
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652,000
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| Proceeds from Issuance of Warrants |
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42,881,000
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0
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| Senior Notes |
475,200,000
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475,200,000
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$ 216,206,000
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| Payments for (Proceeds from) Hedge, Financing Activities |
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(38,594,000)
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0
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| Debt Instrument, Unamortized Discount |
(63,314,000)
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(63,314,000)
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(12,165,000)
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| Deferred financing costs |
(7,486,000)
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(7,486,000)
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(1,629,000)
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| Proceeds from (Payments for) Other Financing Activities |
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4,500,000
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0
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| Debt Instrument, Interest Rate, Effective Percentage |
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7.00%
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| Payments of Debt Issuance Costs |
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(9,403,000)
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0
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| Interest Expense |
8,151,000
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4,019,000
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13,624,000
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7,962,000
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| Long-term Debt, Fair Value |
576,736,000
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576,736,000
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255,300,000
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| Note Warrant2 [Member] |
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| Debt Instrument [Line Items] |
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| Proceeds from Issuance of Warrants |
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$ 37,300,000
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$ 27,600,000
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| Class of Warrant or Right [Domain] |
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| Debt Instrument [Line Items] |
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| Proceeds from Issuance of Warrants |
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5,600,000
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$ 4,100,000
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| Convertible Note Hedge 2 [Member] |
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| Debt Instrument [Line Items] |
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| Proceeds from (Payments for) Other Financing Activities |
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7,700,000
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$ 5,600,000
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| Convertible Note Hedge [Member] |
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| Debt Instrument [Line Items] |
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| Proceeds from (Payments for) Other Financing Activities |
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59,400,000
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42,700,000
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| Convertible Note Hedge 1 [Member] |
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| Debt Instrument [Line Items] |
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| Proceeds from (Payments for) Other Financing Activities |
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51,700,000
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37,100,000
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| Convertible Note/ Hedge Warrant, net [Member] |
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| Debt Instrument [Line Items] |
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| Proceeds from (Payments for) Other Financing Activities |
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16,500,000
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$ 10,900,000
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| Convertible Notes 2016 [Member] | Convertible Notes 2016 [Member] |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
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230,000,000
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| Convertible Note Overallotment [Member] |
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| Debt Instrument [Line Items] |
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| Senior Notes |
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$ 41,000,000
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$ 30,000,000
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| Convertible Debt [Member] |
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| Debt Instrument [Line Items] |
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| Senior Notes |
546,000,000
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546,000,000
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230,000,000
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| Payments of Debt Issuance Costs |
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(9,300,000)
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$ (8,000,000)
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| Convertible Debt [Member] | Convertible Notes 2016 [Member] |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
230,000,000
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230,000,000
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230,000,000
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| Interest Expense, Debt, Excluding Amortization |
1,438,000
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1,438,000
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2,875,000
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2,876,000
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| Accretion of Discount |
2,416,000
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2,255,000
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4,750,000
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4,434,000
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| Amortization of Financing Costs |
326,000
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|
326,000
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|
652,000
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652,000
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| Senior Notes |
221,607,000
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221,607,000
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216,206,000
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| Debt Instrument, Unamortized Discount |
(7,415,000)
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(7,415,000)
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(12,165,000)
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| Deferred financing costs |
(978,000)
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(978,000)
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(1,629,000)
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| Debt Conversion, Converted Instrument, Amount |
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$ 1,000
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| Debt Instrument, Convertible, Conversion Price | $ / shares |
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$ 55.12
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| Debt Instrument, Interest Rate, Stated Percentage |
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2.50%
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| Debt Instrument, Convertible, Conversion Ratio |
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18.1426
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| Interest Expense |
4,180,000
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4,019,000
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8,277,000
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7,962,000
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| Convertible Debt [Member] | Convertible Notes 2020 [Member] |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
316,000,000
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316,000,000
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0
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| Interest Expense, Debt, Excluding Amortization |
1,053,000
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0
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1,448,000
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0
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| Accretion of Discount |
2,569,000
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0
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3,434,000
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0
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| Amortization of Financing Costs |
349,000
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0
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|
465,000
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0
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| Senior Notes |
253,593,000
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253,593,000
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0
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| Debt Instrument, Unamortized Discount |
(55,899,000)
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(55,899,000)
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0
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| Deferred financing costs |
(6,508,000)
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(6,508,000)
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$ 0
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| Debt Conversion, Converted Instrument, Amount |
|
$ 1,000
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| Debt Instrument, Convertible, Conversion Price | $ / shares |
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$ 72.37
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| Debt Instrument, Interest Rate, Stated Percentage |
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1.50%
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| Debt Instrument, Convertible, Conversion Ratio |
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13.8172
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| Interest Expense |
$ 3,971,000
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$ 0
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5,347,000
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$ 0
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| Convertible Notes 2020 [Member] | Convertible Notes 2020 [Member] |
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| Debt Instrument [Line Items] |
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| Debt Instrument, Face Amount |
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$ 316,000,000
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| Convertible Debt 1 [Member] |
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| Debt Instrument [Line Items] |
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| Senior Notes |
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$ 275,000,000
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$ 200,000,000
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| Balance Sheet by Location [Domain] | Convertible Debt [Member] |
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| Debt Instrument [Line Items] |
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| Senior Notes |
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$ 256,700,000
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$ 187,000,000
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| Other Long-term Liabilities [Member] | Convertible Debt [Member] |
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| Debt Instrument [Line Items] |
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| Payments of Debt Issuance Costs |
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$ (7,000,000)
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(6,500,000)
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| Equity [Member] | Convertible Debt [Member] |
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| Debt Instrument [Line Items] |
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| Senior Notes |
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$ 59,300,000
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43,000,000
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| Senior Convertible Notes [Equity net of tax] |
|
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$ 28,000,000
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| Class of Warrant or Right, Outstanding | shares |
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0.6
|
3.8
|
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|
0.5
|
3.5
|
| Warrant Option Strike Price | $ / shares |
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$ 88.46
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$ 63.44
|
| Payments of Debt Issuance Costs |
|
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|
$ 2,430,000
|
|
$ (1,500,000)
|
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