Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Numerator:
Net income	$ 4,704	$ 595
Denominator for basic income per share -
Weighted-average shares	92,566	92,290
Effect of dilutive securities:
Stock options and restricted stock	1,755	974
Weighted-average shares and assumed conversions	94,321	93,264
Net income (loss) per common share - basic (in dollars per share)	$ 0.05	$ 0.01
Net income (loss) per common share - diluted (in dollars per share)	$ 0.05	$ 0.01