Financing Arrangements (Details) - Expenses in Relation to Convertible Notes - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Debt Instrument [Line Items]
Amortization of deferred financing costs	$ 1,872	$ 1,026	$ 8,183	$ 2,022
Convertible Debt [Member]
Debt Instrument [Line Items]
Interest expense at 3.5% coupon rate	255	643	687	1,404
Debt discount amortization	303	695	750	1,531
Amortization of deferred financing costs	55	126	136	277
Loss on Conversion	0	1,126	0	1,198
Debt interest expense	$ 613	$ 2,590	$ 1,573	$ 4,410
Coupon rate	3.50%	3.50%	3.50%	3.50%