Derivative Instruments, Hedging Activities and Fair Value (Details 4) (Designated as hedging instrument, USD $) In Thousands, unless otherwise specified	Jun. 30, 2014
Cross Currency Interest Rate Swap Maturing 2018 [Member]
Derivatives Designated as Hedging Instruments
Contractual Amount	$ 250,000
Cross Currency Interest Rate Swap Maturing 2020 [Member]
Derivatives Designated as Hedging Instruments
Contractual Amount	220,000
Cross Currency Interest Rate Swap Maturing 2016 through 2017 [Member]
Derivatives Designated as Hedging Instruments
Contractual Amount	$ 9,800