Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Basic earnings (loss) per share computation:
Net (loss) income - basic	$ (950)	$ 6,555
Weighted average common shares - basic	53,031,351	52,841,900
Basic (loss) earnings per share	$ (0.02)	$ 0.12
Dillutive earnings (loss) per share computation:
Net (loss) income - basic	$ (950)	$ 6,555
Interest expense related to convertible 3.75% senior notes	0	1,348
Amortization of discount related to convertible 3.75% senior notes	1,809	1,590
Change in the fair value of derivative	0	(8,625)
Net (loss) income - diluted	$ (950)	$ 868
Share Computation:
Weighted average common shares - basic	53,031,351	52,841,900
Effect of convertible 3.75% senior notes	0	12,732,168
Effect of dilutive stock options and warrants	0	1,636,109
Weighted average common shares outstanding - dilluted	53,031,351	67,210,177
Dilluted (loss) earnings per share	$ (0.02)	$ 0.01

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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