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Fair Value Measurements and Derivative Instruments (Details 2) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Total
Assets:
Derivative financial instruments	$ 128,484	$ 96,489
Investments	5,985	6,231
Total Assets	134,469	102,720
Liabilities:
Derivative financial instruments	106,262	85,119
Total Liabilities	106,262	85,119
Level 1
Assets:
Investments	5,985	6,231
Total Assets	5,985	6,231
Level 2
Assets:
Derivative financial instruments	128,484	96,489
Total Assets	128,484	96,489
Liabilities:
Derivative financial instruments	106,262	85,119
Total Liabilities	$ 106,262	$ 85,119

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. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

- Definition

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. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details