Stock-Based Compensation (Company's Restricted Stock Unit Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Stock-Based Compensation [Abstract]
Number of Units Outstanding, Beginning Balance	294
Number of Units, Granted	122
Number of Units, Vested	(100)
Number of Units, Forfeited/Canceled	(11)
Number of Units Outstanding, Ending Balance	305
Number of Units, Expected to vest, net of estimated forfeitures, as of December 31, 2013	303
Weighted-Average Grant Date Fair Value per Share Outstanding, Beginning Balance	$ 43.27
Weighted-Average Grant Date Fair Value per Share, Granted	$ 73.44
Weighted-Average Grant Date Fair Value per Share, Vested	$ 41.82
Weighted-Average Grant Date Fair Value per Share, Forfeited/Canceled	$ 49.03
Weighted-Average Grant Date Fair Value per Share Outstanding, Ending Balance	$ 55.60
Weighted-Average Grant Date Fair Value per Share, Expected to vest, net of estimated forfeitures, as of December 31, 2013	$ 55.69