Stock Compensation Plans (Stock-Based Compensation Impact On Company's Operations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total restricted stock-based compensation expense	$ 2,684	$ 1,938	$ 1,946
Cost Of Revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total restricted stock-based compensation expense	742	495	485
Selling, General And Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total restricted stock-based compensation expense	$ 1,942	$ 1,443	$ 1,461