Derivatives and Hedging Activities Derivatives and Hedge Activities (Master Netting Agreements) (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 41,063,000		$ 24,699,000
Derivative Liability, Fair Value, Gross Liability	(12,442,000)		(6,636,000)
Derivative Asset Fair Value Amount Offset Against Other Derivatives	(10,043,000)		(5,858,000)
Derivative Liability Fair Value Amount Offset Against Other Derivatives	(10,043,000)		(5,858,000)
Derivative Liabilities	(2,399,000)		(778,000)
Derivative, Collateral, Right to Reclaim Cash	2,340,000	[1]	0	[1]
Financial Instruments, Owned and Pledged as Collateral, at Fair Value	0		762,000
Derivative Liabilities, Net Exposure	(59,000)		(16,000)
Derivative Assets	31,020,000		18,841,000
Derivative Asset, Fair Value, Amount Offset Against Collateral	31,020,000		18,841,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	0	[1]	0	[1]
Derivative Asset, Fair Value of Collateral	0		0
Forward Contracts [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	(9,065,000)		(5,658,000)
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability	(3,373,000)		(972,000)
Fair Value, Concentration of Credit Risk, Master Netting Arrangements [Member]
Derivative [Line Items]
Right to reclaim cash in excess of fair value of derivative liability	$ 25,200,000		$ 20,400,000

[1] Excludes cash collateral of $25.2 million and $20.4 million at March 31, 2015 and December 31, 2014, which predominantly consists of collateral transferred by the Company at the initiation of derivative transactions and held by the counterparty as security. These amounts were not netted against the derivative receivables and payables, because, at an individual counterparty level, the collateral exceeded the fair value exposure at both March 31, 2015 and December 31, 2014.