Level 4 Net Income Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Computation of basic and diluted net income per common share
Net income	$ 5,565	$ 80,836
Weighted average common shares outstanding during the period (for basic calculation)	39,372,000	37,569,000
Dilutive effect of other potential common shares	80,000	0
Weighted average common shares and potential common shares (for diluted calculation)	39,452,000	37,569,000
Net income per common share - Basic	$ 0.14	$ 2.15
Net income per common share - Diluted	$ 0.14	$ 2.15
Antidilutive stock awards	200,000	100,000