Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Transaction	Jun. 30, 2012
Numerator [Abstract]
Net loss	$ (5,362,000)	$ (841,000)	$ (21,309,000)	$ (3,790,000)
Denominator [Abstract]
Weighted average shares outstanding - Basic (in shares)	47,563,000	47,376,000	47,508,000	47,347,000
Weighted average shares outstanding - Diluted (in shares)	47,563,000	47,376,000	47,508,000	47,347,000
Basic loss per common share (in dollars per share)	$ (0.11)	$ (0.02)	$ (0.45)	$ (0.08)
Diluted loss per common share (in dollars per share)	$ (0.11)	$ (0.02)	$ (0.45)	$ (0.08)
Stock-Based Compensation [Abstract]
Share-based compensation expense recognized	659,000	967,000	1,353,000	1,715,000
Unrecognized pre-tax compensation expense related to share-based awards not yet vested	3,200,000		3,200,000
Weighted-average period of recognition			1 year 1 month 6 days
Sales Leaseback Transactions [Abstract]
Number of transactions during the period			2
Net gross cash inflow			15,300,000
Recognized loss			$ 900,000
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options exercisable which were not included in computation of diluted earnings per share (in shares)			176,927	221,541