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Derivative Instruments and Hedging Activities Derivative Instrument and Hedging Activities Notional Table (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Derivative [Line Items]
Effective portion of interest rate contracts	$ (3,533)	$ 0
Interest Rate Swap [Member]
Derivative [Line Items]
Notional Amount	250,000
Effective portion of interest rate contracts	(3,533)
Interest Rate Swap [Member] \| Interest Rate Swap 2.571% [Member]
Derivative [Line Items]
Notional Amount	50,000
Strike Price	2.571%
Effective portion of interest rate contracts	(1,062)
Interest Rate Swap [Member] \| Interest Rate Swap 2.476% [Member]
Derivative [Line Items]
Notional Amount	75,000
Strike Price	2.476%
Effective portion of interest rate contracts	(946)
Interest Rate Swap [Member] \| Interest Rate Swap 2.523% [Member]
Derivative [Line Items]
Notional Amount	50,000
Strike Price	2.523%
Effective portion of interest rate contracts	(844)
Interest Rate Swap [Member] \| Interest Rate Swap 2.480% [Member]
Derivative [Line Items]
Notional Amount	50,000
Strike Price	2.48%
Effective portion of interest rate contracts	(654)
Interest Rate Swap [Member] \| Interest Rate Swap 2.348%Member]
Derivative [Line Items]
Notional Amount	25,000
Strike Price	2.348%
Effective portion of interest rate contracts	$ (27)

Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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