Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Numerator:
Income from continuing operations	$ 1,201	$ 5,278	$ 5,829	$ 18,767	$ (1,211)	$ 4,839	$ 6,852	$ 18,104	$ 31,075	$ 28,584	$ 28,155
Basic
Weighted average common shares outstanding	48,967	48,895	49,041	49,103	48,854	49,525	49,615	49,322	49,002	49,328	57,692
Diluted
Stock options										61	106
Restricted stock awards									186	179	135
Contingent shares									64	31	260
Diluted weighted average common shares outstanding	49,326	49,109	49,244	49,531	48,854	49,920	49,958	49,755	49,252	49,599	58,193
Basic earnings per share from continuing operations	$ 0.02	$ 0.11	$ 0.12	$ 0.38	$ (0.02)	$ 0.10	$ 0.14	$ 0.37	$ 0.63	$ 0.58	$ 0.49
Diluted earnings per share from continuing operations	$ 0.02	$ 0.11	$ 0.12	$ 0.38	$ (0.02)	$ 0.10	$ 0.14	$ 0.36	$ 0.63	$ 0.58	$ 0.48