Balance Sheet Account Detail (Fair Value Measurements) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 39,773	$ 124,553
Contingently issuable common stock	14,700	14,700
Derivative liabilities	29,884	0
Quoted prices in active markets for identical assets (Level 1) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	39,773	124,553
Contingently issuable common stock	0	0
Derivative liabilities	0
Significant other observable inputs (Level 2) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Contingently issuable common stock	0	0
Derivative liabilities	0
Fair value of long-term debt	192,100	207,900
Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Contingently issuable common stock	14,700	$ 14,700
Derivative liabilities	$ 29,884