Shareholders' Equity (Components of Other Comprehensive Income (Loss), Including the Related Income Tax Effects) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Increase (Decrease) in Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Unrealized Gains (Losses) on Securities, Beginning Balance	$ 6,710	$ 4,204	$ 2,679	$ 2,899
Accumulated Unrealized Gains (Losses) on Derivative Instruments	(5,292)	(7,082)	(8,191)	(9,521)
Accumulated Foreign Currency Translation Adjustments	6,293	0	0	0
Total Accumulated Other Comprehensive Income (Loss)	7,711	(2,878)	(5,512)	(6,622)
Accumulated Unrealized Gains (Losses) on Securities, Other comprehensive (loss) income during the period	2,506	1,525	(64)
Accumulated Unrealized Gains (Losses) on Derivative Instruments - Other comprehensive income during the period	1,790	1,109	1,330
Accumulated Foreign Currency Translation Adjustments - Other comprehensive income during the period	6,293	0	0
Total Accumulated Other Comprehensive Income (Loss) - Other comprehensive (loss) income during the period	10,589	2,634	1,266
Other Comprehensive Income (Loss), Effect of Change in Accounting Principle, Unrealized Gain (Loss) on Securities, Net of Tax			(156)
Accumulated Unrealized Gains (Losses) on Derivative Instruments - Cumulative effect of change in accounting			0
Accumulated Foreign Currency Translation Adjustments - Cumulative effect of change in accounting			0
Total Accumulated Other Comprehensive Income (Loss) - Cumulative effect of change in accounting	$ 0	$ 0	$ (156)