Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share Reconciliation [Abstract]
Earnings from continuing operations	$ (42,840)	$ 7,799	$ 6,915	$ 8,501	$ 12,211	$ 11,556	$ 11,219	$ 6,662	$ (19,625)	$ 41,648	$ 23,865
Weighted-average shares outstanding for basic earnings per share (in shares)	64,054,000	64,052,000	64,050,000	63,810,000	63,525,000	63,456,000	63,431,000	63,431,000	63,992,000	63,461,000	63,284,000
Common equivalent shares:
Effect of stock-based compensation awards (in shares)									0	959,000	801,000
Weighted-average shares outstanding assuming dilution (in shares)	64,054,000	65,036,000	64,859,000	64,524,000	64,244,000	64,667,000	64,393,000	64,374,000	63,992,000	64,420,000	64,085,000
Basic earnings per share from continuing operations (in dollars per share)	$ (0.67)	$ 0.12	$ 0.11	$ 0.13	$ 0.19	$ 0.18	$ 0.18	$ 0.11	$ (0.31)	$ 0.66	$ 0.38
Diluted earnings per share from continuing operations (in dollars per share)	$ (0.67)	$ 0.12	$ 0.11	$ 0.13	$ 0.19	$ 0.18	$ 0.17	$ 0.10	$ (0.31)	$ 0.65	$ 0.37
Restricted stock (in shares)									481,900	370,400	584,700
Anti-dilutive securities excluded from computation of earnings per share (in shares)									0	229,000	176,000