Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share [Abstract]
Net income (loss)	$ 2,377	$ (11,142)
Weighted average common shares outstanding (used to calculate basic EPS) (in shares)	46,372,000	45,840,000
Dilutive effect of stock options and other stock awards (in shares)	620,000	0
Weighted average common shares outstanding (used to calculate diluted EPS) (in shares)	46,992,000	45,840,000
Earnings (loss) per common share - basic (in dollars per share)	$ 0.05	$ (0.24)
Earnings (loss) per common share - diluted (in dollars per share)	$ 0.05	$ (0.24)
Additional shares used to calculated diluted EPS, if income (in shares)		700,000
Stated interest rate on debt instrument		4.25%
Conversion price (in usd per share)	$ 22.45	$ 22.45
Antidilutive shares excluded from computation of earnings per share, amount (in shares)	1,900,000	1,500,000