Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Earnings Per Share Reconciliation [Abstract]
Earnings from continuing operations	$ 6,915	$ 11,219	$ 15,416	$ 17,881
Weighted-average shares outstanding for basic earnings per share (in shares)	64,050,000	63,431,000	63,931,000	63,431,000
Common equivalent shares:
Effect of stock-based compensation awards (in shares)	809,000	962,000	761,000	952,000
Weighted-average shares outstanding assuming dilution (in shares)	64,859,000	64,393,000	64,692,000	64,383,000
Basic earnings per share from continuing operations (in dollars per share)	$ 0.11	$ 0.18	$ 0.24	$ 0.28
Diluted earnings per share from continuing operations (in dollars per share)	$ 0.11	$ 0.17	$ 0.24	$ 0.28
Anti-dilutive securities excluded from computation of earnings per share (in shares)			13,000	49,000