Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Loss [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax			$ (8,446)
Other comprehensive income (loss), before income taxes	1,341	(890)	5,453	(5,338)
Income tax expense	(487)	329	(2,012)	1,975
Other comprehensive income (loss), net of income taxes	854	(561)	3,441	(3,363)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(5,005)		(5,005)
Cash Flow Hedging [Member]
Accumulated Other Comprehensive Loss [Roll Forward]
Other comprehensive loss before reclassifications			(221)
Amounts reclassified from accumulated other comprehensive loss to interest expense			5,674
Other comprehensive income (loss), before income taxes			5,453
Income tax expense			(2,012)
Other comprehensive income (loss), net of income taxes			$ 3,441