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Long-Term Debt - Convertible Senior Notes Due 2022 (Details) $ / shares in Units, $ in Thousands		1 Months Ended
	Nov. 01, 2016 USD ($) $ / shares	Mar. 31, 2012 USD ($) $ / shares	Dec. 31, 2016 USD ($)	Jul. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Principal amount			$ 657,024
Unamortized debt discount			19,094
Convertible Senior Notes Maturing May 2022 [Member]
Debt Instrument [Line Items]
Principal amount	$ 125,000		125,000			$ 0
Net proceeds from debt issuance	$ 121,700
Interest rate (as a percent)	4.25%
Frequency of periodic payment	semi-annually
Maturity date	May 01, 2022
Initial conversion ratio	0.0719748
Initial conversion price per share (in dollars per share) | $ / shares	$ 13.89
Redemption price as a percentage of principal amount	100.00%
Minimum percentage in aggregate principal amount	25.00%
Unamortized debt discount	$ 16,900		16,513
Expected life used to estimate fair value	5 years 6 months
Effective interest rate (as a percent)	7.30%
Carrying amount of equity component	$ 11,000
Convertible Senior Notes Maturing March 2032 [Member]
Debt Instrument [Line Items]
Principal amount		$ 200,000	60,115			200,000
Repurchased principal amount	$ 125,000			$ 7,600	$ 7,300
Interest rate (as a percent)		3.25%
Frequency of periodic payment		semi-annually
Maturity date		Mar. 15, 2032
Initial conversion ratio		0.0399752
Initial conversion price per share (in dollars per share) | $ / shares		$ 25.02
Redemption price as a percentage of principal amount		100.00%
Unamortized debt discount		$ 35,400	$ 2,581			$ 14,963
Expected life used to estimate fair value		6 years
Effective interest rate (as a percent)		6.90%
Carrying amount of equity component		$ 22,500

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- Definition

Minimum percentage in aggregate principal amount then outstanding holders of the notes are required to have in order to declare the entire principal amount of all the notes, and the interest accrued on such notes, if any, to be immediately due and payable pursuant to customary terms and covenants, including that upon certain events of default occurring and continuing.

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