Stock-Based Compensation, Common Stock Repurchases and Dividends Schedule of Nonvested Activity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Number of nonvested option shares, beginning of year	980
Number of options granted	528	587	284
Nonvested option shares vested	(295)
Nonvested option shares canceled	(251)
Number of nonvested option shares, end of year	962
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted-average grant date fair value of nonvested options, beginning balance		$ 4.83
Weighted-average grant date fair value for granted nonvested option shares	$ 2.44	$ 3.13	$ 7.52
Weighted-average grant date fair value of nonvested option shares vested	$ 5.17
Weighted-average grant date fair value nonvested option shares canceled	$ 4.22
Weighted-average grant date fair value of nonvested options, end of year				$ 3.58