Long-term Debt - Schedule of Interest Expense Related to the Convertible Senior Notes (Details) - Convertible Notes Payable $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Series A Convertible Senior Notes
Debt Instrument [Line Items]
Coupon interest	$ 2,683
Amortization of convertible senior notes discounts and issuance costs	10,833
Total interest expense recognized	$ 13,516
Effective interest rate on the liability component	6.50%
Series B Convertible Senior Notes
Debt Instrument [Line Items]
Coupon interest	$ 4,361
Amortization of convertible senior notes discounts and issuance costs	9,236
Total interest expense recognized	$ 13,597
Effective interest rate on the liability component	7.10%