Fair Value Measurments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Derivative Assets [Abstract]
Derivative assets	$ 0	$ 1,415
Derivative Liabilities [Abstract]
Derivative liabilities	40,007	27,291
Fair Value, Inputs, Level 2 [Member]
Derivative Assets [Abstract]
Derivative assets	0
Derivative Liabilities [Abstract]
Derivative liabilities	$ 40,007

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details