Shareholders' Equity (Narrative) (Details) (USD $)	3 Months Ended						3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Restricted Stock Units (RSU's) [Member]	Mar. 31, 2013 Restricted Shares [Member]	Mar. 31, 2012 Restricted Shares [Member]	Dec. 31, 2012 Restricted Shares [Member]	Mar. 31, 2013 Stock Options [Member]	Apr. 16, 2013 Company's 2013 Incentive Plan [Member]
Shareholders Equity and Share-Based Payments [Line Items]
Compensation cost	$ 1,185,000	$ 916,000
Total income tax benefit recognized related to stock-based compensation	474,000	366,000
Total intrinsic value of options exercised	7,000	7,000
Cash received from exercise of stock options	33,000	20,000
Stock options granted	0	0
Total fair value of restricted stock shares/units vested and released				1,300,000	1,600,000
Restricted stock units outstanding, shares			130,000	960,000		763,000
Restricted stock units outstanding, weighted average grant dare fair value, usd per share			$ 10.41	$ 12.31		$ 12.39
Total unrecognized compensation cost related to nonvested stock awards			443,000	7,100,000			1,400,000
Expected recognized over a weighted-average period, years			1 year 1 month 6 days	2 years 1 month 6 days			1 year 6 months
Income tax benefits received	517,000	622,000
Net tax benefit from stock options exercised	10,000
Tax deficiency from stock options exercised		$ 42,000
Shares of common stock for issuance under the plan								4,000,000