Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Income
Income from continuing operations	$ 10,089	$ 6,420	$ 5,637	$ 1,845	$ 6,734	$ 4,451	$ 6,936	$ 6,320	$ 23,991	$ 24,441	$ 35,396
Income (loss) from discontinued operations					(168)	(12,624)	1,373	348		(11,071)	(118,749)
Net income (loss)	$ 10,089	$ 6,420	$ 5,637	$ 1,845	$ 6,566	$ (8,173)	$ 8,309	$ 6,668	$ 23,991	$ 13,370	$ (83,353)
Basic EPS
Weighted-average common shares outstanding used in earnings per share computations									62,444	62,503	62,887
Continuing operations (in dollars per share)	$ 0.16	$ 0.10	$ 0.09	$ 0.03	$ 0.11	$ 0.07	$ 0.11	$ 0.10	$ 0.38	$ 0.39	$ 0.56
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ (0.01)	$ (0.20)	$ 0.02	$ 0.01	$ 0.00	$ (0.18)	$ (1.89)
Basic earnings (loss) per common share (in dollars per share)	$ 0.16us-gaap_EarningsPerShareBasic	$ 0.10us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic	$ 0.03us-gaap_EarningsPerShareBasic	$ 0.10us-gaap_EarningsPerShareBasic	$ (0.13)us-gaap_EarningsPerShareBasic	$ 0.13us-gaap_EarningsPerShareBasic	$ 0.11us-gaap_EarningsPerShareBasic	$ 0.38us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic	$ (1.33)us-gaap_EarningsPerShareBasic
Diluted EPS
Shares used in diluted earnings per share computations									62,658	62,812	63,148
Continuing operations (in dollars per share)	$ 0.16	$ 0.10	$ 0.09	$ 0.03	$ 0.11	$ 0.07	$ 0.11	$ 0.10	$ 0.38	$ 0.39	$ 0.56
Discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ (0.01)	$ (0.20)	$ 0.02	$ 0.01	$ 0.00	$ (0.18)	$ (1.88)
Diluted earnings (loss) per common share (in dollars per share)	$ 0.16us-gaap_EarningsPerShareDiluted	$ 0.10us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted	$ 0.03us-gaap_EarningsPerShareDiluted	$ 0.10us-gaap_EarningsPerShareDiluted	$ (0.13)us-gaap_EarningsPerShareDiluted	$ 0.13us-gaap_EarningsPerShareDiluted	$ 0.11us-gaap_EarningsPerShareDiluted	$ 0.38us-gaap_EarningsPerShareDiluted	$ 0.21us-gaap_EarningsPerShareDiluted	$ (1.32)us-gaap_EarningsPerShareDiluted
Computation of Shares Used in Earnings Per Share Computations
Weighted-average common shares outstanding									62,444	62,503	62,887
Weighted-average common equivalent shares - dilutive effect of stock options and awards									214	309	261
Shares used in diluted earnings per share computations									62,658	62,812	63,148

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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