Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Basic earnings per share computation:
Net income - basic	$ 6,555	$ 167
Weighted average common shares —basic	52,841,900	46,826,733
Basic earnings per share	$ 0.12us-gaap_EarningsPerShareBasic	$ 0us-gaap_EarningsPerShareBasic
Dilutive earnings per share computation:
Net income - basic	6,555	167
Interest expense related to convertible 3.75% senior notes	1,348	0
Amortization of discount related to convertible 3.75% senior notes	1,590	0
Change in the fair value of derivative liability	(8,625)us-gaap_UnrealizedGainLossOnDerivatives	0us-gaap_UnrealizedGainLossOnDerivatives
Net income - diluted	$ 868	$ 167
Share Computation:
Weighted average common shares —basic	52,841,900	46,826,733
Effect of convertible 3.75% senior notes	12,732,168	0
Effect of dilutive stock options and warrants	1,636,109	1,702,870
Weighted average common shares outstanding —diluted	67,210,177	48,529,603
Dilluted earnings per share	$ 0.01us-gaap_EarningsPerShareDiluted	$ 0us-gaap_EarningsPerShareDiluted

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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