Shareholders' Equity - Summary of Changes in Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Increase (Decrease) in Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance	$ (765)		$ (7,786)		$ (2,853)		$ (9,164)
Other comprehensive income (loss) before reclassifications	(4,579)		(1,691)		(4,167)		(3,145)
Amounts reclassified out of accumulated other comprehensive income (loss)	1,215	[1]	2,525	[1]	2,891	[1]	5,357	[1]
Ending balance	(4,129)		(6,952)		(4,129)		(6,952)
Unrealized Gains (Losses) on Cash Flow Hedges
Increase (Decrease) in Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance	(765)	[2]	(9,582)	[2]	(2,853)	[2]	(12,416)	[2]
Other comprehensive income (loss) before reclassifications	(4,579)	[2]	(804)	[2]	(4,167)	[2]	(1,123)	[2]
Amounts reclassified out of accumulated other comprehensive income (loss)	1,215	[1],[2]	2,804	[1],[2]	2,891	[1],[2]	5,957	[1],[2]
Ending balance	(4,129)	[2]	(7,582)	[2]	(4,129)	[2]	(7,582)	[2]
Unrealized Gains (Losses) on Investments Available for Sale
Increase (Decrease) in Accumulated Other Comprehensive Loss [Roll Forward]
Beginning balance	0	[2]	1,796	[2]	0	[2]	3,252	[2]
Other comprehensive income (loss) before reclassifications	0	[2]	(887)	[2]	0	[2]	(2,022)	[2]
Amounts reclassified out of accumulated other comprehensive income (loss)	0	[1],[2]	(279)	[1],[2]	0	[1],[2]	(600)	[1],[2]
Ending balance	$ 0	[2]	$ 630	[2]	$ 0	[2]	$ 630	[2]

[1] Amounts reclassified out of accumulated other comprehensive income (loss) consist of the following:

[2] Amounts in this table are net of tax