Derivatives Derivative Effect on Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	$ 7,077,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		4,103
Dedesignated cash flow hedge amortization	0
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 5,525,000