Employee Benefits (Details 4) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share Based Compensation Arrangement by Share Based Payment Award Options Nonvested Weighted Average Grant Date Fair Value [Roll Forward]
Granted (in dollars per share)	$ 0.45	$ 3.26	$ 4.55
Stock Options
Share Based Compensation Arrangement by Share Based Payment Award Nonvested [Roll Forward]
Nonvested at the beginning of the period (in shares)	406,436
Granted (in shares)	217,000
Vested (in shares)	(157,736)
Forfeited (in shares)	(54,966)
Expired (in shares)	0
Nonvested at the end of the period (in shares)	410,734
Share Based Compensation Arrangement by Share Based Payment Award Options Nonvested Weighted Average Grant Date Fair Value [Roll Forward]
Nonvested at the beginning of the period (in dollars per share)	$ 3.70
Granted (in dollars per share)	$ 0.45
Vested (in dollars per share)	$ 3.84
Forfeited (in dollars per share)	$ 4.34
Expired (in dollars per share)	$ 0.00
Nonvested at the end of the period (in dollars per share)	$ 1.85
Unrecognized compensation cost	$ 0.6
Period over which unrecognized compensation cost is expected to be recognized	5 years