Derivative Instruments - Designated as hedging, Financial Position (Details) (Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 390	$ 940
Interest Rate Swap [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	860	1,270
Interest Rate Swap [Member] \| Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	(550)	(180)
Foreign Exchange Contract [Member] \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	290	0
Foreign Exchange Contract [Member] \| Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ (210)	$ (150)

Fair value, after offset of derivative liability, of 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References+ Details

Fair value, after offset of derivative asset, of 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, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References+ Details