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Fair Value Measurements - Summary of Financial Liability Measured at Fair Value on a Recurring Basis (Details 2) (Interest Rate Swap [Member], Designated as Hedging Instrument [Member], Cash Flow Hedging [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge	$ 1,020us-gaap_DerivativeLiabilities	$ 998us-gaap_DerivativeLiabilities	$ 1,606us-gaap_DerivativeLiabilities
Interest rate swap - cash flow hedge, loss	488	319
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge	1,020	998
Fair Value, Measurements, Recurring [Member] \| Fair Values [Member]
Recurring financial liability that was measured at carrying value
Interest rate swap - cash flow hedge	$ 1,020	$ 998

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

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