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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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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.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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