Derivatives Fair Value of Convertible Debt Hedges (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Convertible Debt Conversion Feature	$ (20,901,000)	$ (20,901,000)	$ 0
Convertible Debt Conversion Feature Gain (Loss)	7,732,000	13,579,000
Convertible note hedge asset	16,678,000	16,678,000	$ 0
Convertible Debt Note Hedge Gain (Loss)	(6,540,000)	(11,297,000)
Fair Values Convertible Debt Hedges, Net	(4,223,000)	(4,223,000)
Fair Values Convertible Debt Hedges, Gain (Loss)	1,192,000	2,282,000
Fair Value, Inputs, Level 2 | Convertible Debt Conversion Feature [Member] | Fair Value, Measurements, Recurring
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Convertible Debt Conversion Feature	(20,901,000)	(20,901,000)
Fair Value, Inputs, Level 2 | Convertible Debt Bond Hedge [Member] | Fair Value, Measurements, Recurring
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Convertible note hedge asset	$ 16,678,000	$ 16,678,000