Basis of Presentation and Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator [Abstract]
Net loss	$ (15,947,000)	$ (2,949,000)
Denominator [Abstract]
Weighted average shares outstanding - Basic (in shares)	47,453,000	47,319,000
Weighted average shares outstanding - Diluted (in shares)	47,453,000	47,319,000
Basic loss per common share (in dollars per share)	$ (0.34)	$ (0.06)
Diluted loss per common share (in dollars per share)	$ (0.34)	$ (0.06)
Stock-Based Compensation [Abstract]
Share-based compensation expense recognized	694,000	748,000
Unrecognized pre-tax compensation expense related to share-based awards not yet vested	4,800,000
Weighted-average period of recognition	1 year 8 months 12 days
Sales Leaseback Transactions [Abstract]
Number of transactions during the period	2
Net gross cash inflow	15,300,000
Recognized gains	400,000
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)	194,068	225,922