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Summary of Significant Accounting Policies - Corrections (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2015 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Aug. 31, 2014 | Jan. 31, 2010
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  | $ (27,481) | $ (230,700) | $ (9,800) | $ (5,400) |  |
Deferred tax assets acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 27,500
Net income | $ 6,341 | $ 199,165 | $ 23,564 | $ 754 | $ 7,055 | $ 1,280 | $ 1,592 | $ 2,097 |  |  | 229,824 | 12,024 | 11,420 |  |
Comprehensive income |  |  |  |  |  |  |  |  |  |  | $ 229,792 | $ 14,063 | $ 14,334 |  |
Net income, basic (in usd per share) | $ (0.32) | $ (10.01) | $ (1.19) | $ (0.04) | $ (0.35) | $ (0.06) | $ (0.08) | $ (0.10) |  |  | $ (11.61) | $ (0.59) | $ (0.56) |  |
Net income, diluted (in USD per share) | $ (0.29) | $ (9.28) | $ (1.11) | $ (0.04) | $ (0.34) | $ (0.06) | $ (0.07) | $ (0.10) |  |  | $ (10.83) | $ (0.56) | $ (0.55) |  |
Long-term deferred tax assets | $ 189,083 |  |  |  |  |  |  |  |  |  | $ 189,083 |  |  |  |
Income tax (expense) benefit | 514 | $ 191,881 | $ (265) | $ (15) | $ (280) | $ (124) | $ 47 | $ (53) |  |  | 192,115 | $ (410) | $ (374) |  |
Current debt issuance costs | 0 |  |  |  | 809 |  |  |  |  |  | 0 | 809 |  |  |
Long-term debt issuance costs | 0 |  |  |  | 3,388 |  |  |  |  |  | 0 | 3,388 |  |  |
Assets | 503,061 |  |  |  | 258,029 |  |  |  |  |  | 503,061 | 258,029 |  |  |
2019 convertible senior notes, net | 201,985 |  |  |  |  |  |  |  |  |  | 201,985 |  |  |  |
Liabilities, Current | 222,821 |  |  |  | 22,779 |  |  |  |  |  | 222,821 | 22,779 |  |  |
Convertible debt, noncurrent | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Liabilities | 226,151 |  |  |  | 233,621 |  |  |  |  |  | 226,151 | 233,621 |  |  |
Carrying value of equity component | 39,628 |  |  |  |  |  |  |  |  |  | 39,628 |  |  |  |
Additional Paid in Capital | 661,850 |  |  |  | 680,660 |  |  |  |  |  | 661,850 | 680,660 |  |  |
Retained Earnings (Accumulated Deficit) | (429,491) |  |  |  | (659,315) |  |  |  |  |  | (429,491) | (659,315) |  |  |
Stockholders' Equity Attributable to Parent | 237,282 |  |  |  | 26,318 |  |  |  |  |  | 237,282 | 26,318 |  |  |
Liabilities and Equity | 503,061 |  |  |  | 258,029 |  |  |  |  |  | 503,061 | 258,029 |  |  |
Current contingent liabilities | 10,414 |  |  |  | $ 6,796 |  |  |  |  |  | 10,414 | $ 6,796 |  |  |
Previously Reported Understatement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 2,100 |  |  |  |  |  |  |  | 2,100 |  |  |  |  |
Long-term deferred tax assets | 2,100 |  |  |  |  |  |  |  |  |  | 2,100 |  |  |  |
Income tax (expense) benefit |  | 2,100 |  |  |  |  |  |  |  | $ 2,100 |  |  |  |  |
Understatement as percent of previously reported EPS (percent) |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |
Current contingent liabilities |  |  | 600 |  |  |  |  |  | $ 600 |  |  |  |  |  |
Previously Reported Overstatement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  | $ 600 |  |  |  |  |  | $ 600 |  |  |  |  |  |
Net income, basic (in usd per share) |  |  | $ (0.03) |  |  |  |  |  | $ (0.03) |  |  |  |  |  |
Impact of Correction of Immaterial Errors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ (600) |  |  |  |  |  |  |  |  |  |  |  |  |
Net income, basic (in usd per share) |  | $ 0.03 |  |  |  |  |  |  |  |  |  |  |  |  |
Impact of Correction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income, basic (in usd per share) |  |  |  |  |  |  |  |  |  | $ 0.11 |  |  |  |  |
Net income, diluted (in USD per share) |  |  |  |  |  |  |  |  |  | $ 0.10 |  |  |  |  |
Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | (27,481) |  |  |  |
Comprehensive income |  |  |  |  |  |  |  |  |  |  | $ (27,481) |  |  |  |
Net income, basic (in usd per share) |  |  |  |  |  |  |  |  |  |  | $ 1.39 |  |  |  |
Net income, diluted (in USD per share) |  |  |  |  |  |  |  |  |  |  | $ 1.29 |  |  |  |
Long-term deferred tax assets | (27,481) |  |  |  |  |  |  |  |  |  | $ (27,481) |  |  |  |
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  |  | 27,481 |  |  |  |
Current debt issuance costs | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Long-term debt issuance costs | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Assets | (27,481) |  |  |  |  |  |  |  |  |  | (27,481) |  |  |  |
2019 convertible senior notes, net | 205,372 |  |  |  |  |  |  |  |  |  | 205,372 |  |  |  |
Liabilities, Current | 205,372 |  |  |  |  |  |  |  |  |  | 205,372 |  |  |  |
Convertible debt, noncurrent | (205,372) |  |  |  |  |  |  |  |  |  | (205,372) |  |  |  |
Carrying value of equity component | 39,628 |  |  |  |  |  |  |  |  |  | 39,628 |  |  |  |
Additional Paid in Capital | (39,628) |  |  |  |  |  |  |  |  |  | (39,628) |  |  |  |
Retained Earnings (Accumulated Deficit) | (27,481) |  |  |  |  |  |  |  |  |  | (27,481) |  |  |  |
Stockholders' Equity Attributable to Parent | (67,109) |  |  |  |  |  |  |  |  |  | (67,109) |  |  |  |
Liabilities and Equity | (27,481) |  |  |  |  |  |  |  |  |  | (27,481) |  |  |  |
Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 257,305 |  |  |  |
Comprehensive income |  |  |  |  |  |  |  |  |  |  | $ 257,273 |  |  |  |
Net income, basic (in usd per share) |  |  |  |  |  |  |  |  |  |  | $ (13.00) |  |  |  |
Net income, diluted (in USD per share) |  |  |  |  |  |  |  |  |  |  | $ (12.12) |  |  |  |
Long-term deferred tax assets | 216,564 |  |  |  |  |  |  |  |  |  | $ 216,564 |  |  |  |
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  |  | 219,596 |  |  |  |
Current debt issuance costs | 860 |  |  |  |  |  |  |  |  |  | 860 |  |  |  |
Long-term debt issuance costs | 2,527 |  |  |  |  |  |  |  |  |  | 2,527 |  |  |  |
Assets | 533,929 |  |  |  |  |  |  |  |  |  | 533,929 |  |  |  |
2019 convertible senior notes, net | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Liabilities, Current | 20,836 |  |  |  |  |  |  |  |  |  | 20,836 |  |  |  |
Convertible debt, noncurrent | 205,372 |  |  |  |  |  |  |  |  |  | 205,372 |  |  |  |
Liabilities | 229,538 |  |  |  |  |  |  |  |  |  | 229,538 |  |  |  |
Carrying value of equity component | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Additional Paid in Capital | 701,478 |  |  |  |  |  |  |  |  |  | 701,478 |  |  |  |
Retained Earnings (Accumulated Deficit) | (402,010) |  |  |  |  |  |  |  |  |  | (402,010) |  |  |  |
Stockholders' Equity Attributable to Parent | 304,391 |  |  |  |  |  |  |  |  |  | 304,391 |  |  |  |
Liabilities and Equity | 533,929 |  |  |  |  |  |  |  |  |  | 533,929 |  |  |  |
Senior Notes | 2019 Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,500 |
Convertible debt, noncurrent |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 192,500 |
Carrying value of equity component | 51,300 |  |  |  |  |  |  |  |  |  | $ 51,300 |  |  |  |
Stock price trigger threshold (percent) |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  |  |
Adoption of ASU 2015-03 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term deferred tax assets | 0 |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Current debt issuance costs | (860) |  |  |  |  |  |  |  |  |  | (860) |  |  |  |
Long-term debt issuance costs | (2,527) |  |  |  |  |  |  |  |  |  | (2,527) |  |  |  |
Assets | (3,387) |  |  |  |  |  |  |  |  |  | (3,387) |  |  |  |
2019 convertible senior notes, net | (3,387) |  |  |  |  |  |  |  |  |  | (3,387) |  |  |  |
Liabilities, Current | (3,387) |  |  |  |  |  |  |  |  |  | (3,387) |  |  |  |
Convertible debt, noncurrent | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Liabilities | (3,387) |  |  |  |  |  |  |  |  |  | (3,387) |  |  |  |
Carrying value of equity component | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Additional Paid in Capital | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Retained Earnings (Accumulated Deficit) | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Stockholders' Equity Attributable to Parent | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Liabilities and Equity | $ (3,387) |  |  |  |  |  |  |  |  |  | $ (3,387) |  |  |  |

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