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Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Details) (Recurring Measurements, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets and liabilities that are measured at fair value on a recurring basis
Cash equivalents	$ 10,000	$ 30,000
Level 1
Assets and liabilities that are measured at fair value on a recurring basis
Cash equivalents	10,000	30,000
Level 2
Assets and liabilities that are measured at fair value on a recurring basis
Cash equivalents	0	0
Level 3
Assets and liabilities that are measured at fair value on a recurring basis
Cash equivalents	0	0
Interest rate swaps
Assets and liabilities that are measured at fair value on a recurring basis
Interest rate swap	(471)	(723)
Interest rate swaps \| Level 1
Assets and liabilities that are measured at fair value on a recurring basis
Interest rate swap	0	0
Interest rate swaps \| Level 2
Assets and liabilities that are measured at fair value on a recurring basis
Interest rate swap	(471)	(723)
Interest rate swaps \| Level 3
Assets and liabilities that are measured at fair value on a recurring basis
Interest rate swap	$ 0	$ 0

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.

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