Fair Value Measurements - Non-Financial Assets Measured and Recorded at Fair Value on a Non-Recurring (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets measured on a non-recurring basis
Goodwill	$ 32,047,000us-gaap_Goodwill	$ 32,047,000us-gaap_Goodwill	$ 32,547,000us-gaap_Goodwill
Goodwill, loss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Intangible assets, other than goodwill	35,902,000us-gaap_FiniteLivedIntangibleAssetsNet	40,092,000us-gaap_FiniteLivedIntangibleAssetsNet
Long-lived assets	71,414,000us-gaap_PropertyPlantAndEquipmentNet	74,869,000us-gaap_PropertyPlantAndEquipmentNet	93,725,000us-gaap_PropertyPlantAndEquipmentNet
Restructuring and Impairment Charge [Member]
Assets measured on a non-recurring basis
long-lived assets, loss	433,000
Impairment charge		$ 3,770,000

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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