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Basis of Presentation and Significant Accounting Policies (Prior Period Corrections of Statement of Income and Comprehensive Income) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Aug. 31, 2014 | Jan. 31, 2010
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of valuation allowance released |  |  |  |  |  |  | $ (27,481) |  |  |  |
Deferred tax assets acquired |  |  |  |  |  |  |  |  |  |  | $ 27,500
Income Tax Expense (Benefit) |  | $ 160 |  | $ (191,881) |  | $ (28) | (191,602) |  |  |  |
Income Statement Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income |  | 1,051 |  | 199,165 |  | 1,490 | 223,483 |  |  |  |
Comprehensive income |  | $ 958 |  | $ 195,500 |  | $ 187 | $ 223,870 |  |  |  |
Basic earnings per share (in usd per share) | [1] | $ 0.05 |  | $ 10.01 |  | $ 0.07 | $ 11.32 |  |  |  |
Diluted earnings per share data (in usd per share) |  | $ 0.05 | [1] | $ 9.28 | [1] | $ 0.07 | $ 10.58 | [1] |  |  |
Basic (in shares) |  | 20,887,000 |  | 19,887,000 |  | 20,806,000 | 19,741,000 |  |  |  |
Diluted (in shares) |  | 22,997,279 |  | 21,459,648 |  | 22,742,249 | 21,121,972 |  |  |  |
Balance Sheet Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  | $ 133,486 |  | $ 181,049 |  | $ 133,486 | $ 181,049 |  | $ 189,083 |  |
Total assets |  | 600,865 |  | 496,326 |  | 600,865 | 496,326 |  | 503,061 |  |
2019 convertible senior notes, net - current |  | 210,115 |  |  |  | 210,115 |  |  | 201,985 |  |
Total current liabilities |  | 226,131 |  |  |  | 226,131 |  |  | 222,821 |  |
2019 convertible senior notes, net - long term |  | 0 |  |  |  | 0 |  |  | 0 |  |
Equity component of currently redeemable convertible notes (Note 5) |  | 32,138 |  |  |  | 32,138 |  |  | 39,628 |  |
Additional paid-in capital |  | 762,576 |  |  |  | 762,576 |  |  | 661,850 |  |
Accumulated deficit |  | (428,001) |  | (435,832) |  | (428,001) | (435,832) |  | (429,491) |  |
Total stockholders' equity |  | 338,255 |  | 266,807 |  | 338,255 | 266,807 |  | 237,282 |  |
Total liabilities and stockholders' equity |  | 600,865 |  | 496,326 |  | 600,865 | 496,326 |  | 503,061 |  |
As Reported |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  | (219,362) |  |  | (219,083) |  |  |  |
Income Statement Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  | 226,646 |  |  | 250,964 |  |  |  |
Comprehensive income |  |  |  | $ 222,981 |  |  | $ 251,351 |  |  |  |
Basic earnings per share (in usd per share) |  |  |  | $ 11.40 |  |  | $ 12.71 |  |  |  |
Diluted earnings per share data (in usd per share) |  |  |  | $ 10.56 |  |  | $ 11.88 |  |  |  |
Basic (in shares) |  |  |  |  |  |  | 19,741,000 |  |  |  |
Diluted (in shares) |  |  |  |  |  |  | 21,122,000 |  |  |  |
Balance Sheet Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  | $ 208,530 |  |  | $ 208,530 |  | 216,564 |  |
Total assets |  |  |  | 523,807 |  |  | 523,807 |  | 530,542 |  |
2019 convertible senior notes, net - current |  |  |  |  |  |  |  |  | 0 |  |
Total current liabilities |  |  |  |  |  |  |  |  | 20,836 |  |
2019 convertible senior notes, net - long term |  |  |  |  |  |  |  |  | 201,985 |  |
Equity component of currently redeemable convertible notes (Note 5) |  |  |  |  |  |  |  |  | 0 |  |
Additional paid-in capital |  |  |  |  |  |  |  |  | 701,478 |  |
Accumulated deficit |  |  |  | (408,351) |  |  | (408,351) |  | (402,010) |  |
Total stockholders' equity |  |  |  | 294,288 |  |  | 294,288 |  | 304,391 |  |
Total liabilities and stockholders' equity |  |  |  | 523,807 |  |  | 523,807 |  | 530,542 |  |
Adjustments |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  | (27,481) |  |  |  |
Income Statement Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  | (27,481) |  |  | (27,481) |  |  |  |
Comprehensive income |  |  |  | $ (27,481) |  |  | $ (27,481) |  |  |  |
Basic earnings per share (in usd per share) |  |  |  | $ (1.39) |  |  | $ (1.39) |  |  |  |
Diluted earnings per share data (in usd per share) |  |  |  | $ (1.28) |  |  | $ (1.30) |  |  |  |
Basic (in shares) |  |  |  |  |  |  | 0 |  |  |  |
Diluted (in shares) |  |  |  |  |  |  | 0 |  |  |  |
Balance Sheet Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes |  |  |  | $ (27,481) |  |  | $ (27,481) |  | (27,481) |  |
Total assets |  |  |  | (27,481) |  |  | (27,481) |  | (27,481) |  |
2019 convertible senior notes, net - current |  |  |  |  |  |  |  |  | 201,985 |  |
Total current liabilities |  |  |  |  |  |  |  |  | 201,985 |  |
2019 convertible senior notes, net - long term |  |  |  |  |  |  |  |  | (201,985) |  |
Equity component of currently redeemable convertible notes (Note 5) |  |  |  |  |  |  |  |  | 39,628 |  |
Additional paid-in capital |  |  |  |  |  |  |  |  | (39,628) |  |
Accumulated deficit |  |  |  | (27,481) |  |  | (27,481) |  | (27,481) |  |
Total stockholders' equity |  |  |  | (27,481) |  |  | (27,481) |  | (67,109) |  |
Total liabilities and stockholders' equity |  |  |  | (27,481) |  |  | $ (27,481) |  | $ (27,481) |  |
2019 convertible senior notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of stock price trigger to classify convertible debt as current |  |  |  |  |  |  |  |  | 130.00% |  |
Balance Sheet Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
2019 convertible senior notes, net - long term |  |  |  |  |  |  |  |  |  | $ 192,500 |
Equity component of currently redeemable convertible notes (Note 5) |  | $ 51,300 |  |  |  | $ 51,300 |  |  | $ 51,300 |  |
Previously Reported Overstatement |  |  |  |  |  |  |  |  |  |  |
Income Statement Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ 27,500 |  |
10-K [Member] | Adjustments |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  |  |  | $ (27,481) |  |  |  |  |  |  |
[1] | The sum of net income per share amounts may not equal the totals due to rounding

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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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