Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator:
Net income (loss) available to common shareholders	$ 8,339	$ 2,106	$ 20,651	$ 7,163
Denominator:
Basic weighted average shares outstanding	15,571,207	15,397,476	15,522,492	15,345,529
Effect of dilutive securities:
SARs and options	445,178	546,672	447,932	557,531
Convertible notes	1,155,920	1,148,303	965,967	1,029,066
Restricted stock	37,872	60,728	27,691	49,932
Diluted weighted average shares outstanding	17,210,177	17,153,179	16,964,082	16,982,058
Basic earnings per share	$ 0.54	$ 0.14	$ 1.33	$ 0.47
Diluted earnings per share	$ 0.48	$ 0.12	$ 1.22	$ 0.42