Derivative Financial Instruments (Narrative) (Details) - Interest Rate Swap [Member] $ in Thousands	Jun. 30, 2015 USD ($)
Derivative [Line Items]
Derivative, Notional Amount	$ 455,750
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount	251,150
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 204,600

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant