Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share, Basic & Dilutive, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Attributable to Parent	$ 32,602,000	$ 78,901,000	$ 61,667,000	$ 77,040,000
Weighted Average Number of Shares Outstanding, Basic	36,022	40,443	36,486	40,444
Weighted Average Number Diluted Shares Outstanding Adjustment	420	379	397	199
Weighted Average Number of Shares Outstanding, Diluted	36,442	40,822	36,883	40,643
Dilutive Securities, Efffect on Basic Earnings Per Share [2]	$ (0.02)	$ (0.02)	$ (0.02)	$ 0.00
Net Incme Per Common Share, Basic	$ 0.91	$ 1.95	$ 1.69	$ 1.90
Net Income Per Common Share, Diluted	$ 0.89	$ 1.93	$ 1.67	$ 1.90
Convertible Debt Securities [Member]
Earnings Per Share, Basic & Dilutive, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,366	4,130	6,803	4,130
Warrant [Member]
Earnings Per Share, Basic & Dilutive, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	8,496	4,130	6,808	4,130
Employee Stock Option [Member]
Earnings Per Share, Basic & Dilutive, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	94	213	56	160