Stockholders' Equity (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended		0 Months Ended
	Jan. 06, 2014	Mar. 31, 2014	Mar. 31, 2013	Jan. 06, 2014 Common Stock	Jan. 06, 2014 Deferred Stock Units, Restricted Stock and Stock Awards	May 22, 2014 Scenario, Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average diluted shares outstanding excludes shares of common stock subject to stock options		322,542	337,295
Special cash dividend (in usd per share)	$ 2.00
Payments of special dividends				$ 46,700,000
Special dividend, stock per share or unit	2.00
Special dividend, aggregate value					1,800,000
Reduction in exercise price for all outstanding stock options	$ 2.00
Deferred stock units issued to executive officers		43,188
Deferred stock units issued to executive officers, exercise price		$ 45.98
Deferred stock units issued to executive officers, aggregate fair value		$ 2,000,000
Increase in shares authorized						1,678,632