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Fair Value Measurements (Derivative Instruments, Fair Value) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets
Derivative instruments	$ 56,963	$ 322,337
Liabilities
Derivative instruments	(459)	(988)
Net derivative asset	56,504	321,349
Level 2
Assets
Derivative instruments	69,864	294,865
Liabilities
Derivative instruments	2,699	2,048
Net derivative asset	72,563	296,913
Level 3
Assets
Derivative instruments	(12,901)	27,472
Liabilities
Derivative instruments	(3,158)	(3,036)
Net derivative asset	$ (16,059)	$ 24,436

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.

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