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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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 after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

Terms of Interest Rate Swap Agreements (Details) In Thousands, unless otherwise specified	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2015 Interest Rate Swap US Dollar Notional Amount USD ($)	Dec. 31, 2014 Interest Rate Swap US Dollar Notional Amount USD ($)	Mar. 31, 2015 Interest Rate Swap Pound Sterling Notional Amount USD ($)	Mar. 31, 2015 Interest Rate Swap Pound Sterling Notional Amount GBP (£)	Dec. 31, 2014 Interest Rate Swap Pound Sterling Notional Amount USD ($)	Dec. 31, 2014 Interest Rate Swap Pound Sterling Notional Amount GBP (£)	Mar. 31, 2015 Interest Rate Swap Canadian Dollar Notional Amount USD ($)	Mar. 31, 2015 Interest Rate Swap Canadian Dollar Notional Amount CAD	Dec. 31, 2014 Interest Rate Swap Canadian Dollar Notional Amount USD ($)	Dec. 31, 2014 Interest Rate Swap Canadian Dollar Notional Amount CAD
Derivative
Derivative, Notional Amount			$ 420,000	$ 420,000		£ 50,000		£ 50,000		25,000		25,000
Derivative Liability, Current	2,014us-gaap_DerivativeLiabilitiesCurrent	2,691us-gaap_DerivativeLiabilitiesCurrent	1,903	2,691					111
Derivative Liability, Noncurrent	$ 2,709us-gaap_DerivativeLiabilitiesNoncurrent	$ 2,527us-gaap_DerivativeLiabilitiesNoncurrent	$ 1,857	$ 1,615	$ 852		$ 893		$ 0		$ 19