Goodwill, Intangible Assets and Deferred Financing Costs - Components of Intangible Assets and Deferred Financing Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Net intangible assets	$ 1,634us-gaap_FiniteLivedIntangibleAssetsNet
Deferred financing costs	14,026us-gaap_DeferredFinanceCostsGross	12,629us-gaap_DeferredFinanceCostsGross
Less accumulated amortization	(4,255)	(1,551)
Net deferred financing costs	9,771us-gaap_DeferredFinanceCostsNet	11,078us-gaap_DeferredFinanceCostsNet
Net amortizable intangible assets and deferred financing costs	11,707	14,470
Amortization of other intangibles	1,540us-gaap_AmortizationOfIntangibleAssets	1,772us-gaap_AmortizationOfIntangibleAssets	2,305us-gaap_AmortizationOfIntangibleAssets
Patents and licenses
Finite-Lived Intangible Assets [Line Items]
Intangible assets	32,636	31,920
Less accumulated amortization	(30,971)	(29,981)
Net intangible assets	1,665	1,939
Trademarks
Finite-Lived Intangible Assets [Line Items]
Intangible assets	18,920	18,920
Less accumulated amortization	(18,920)	(17,765)
Net intangible assets	0	1,155
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Intangible assets	1,024	937
Less accumulated amortization	(753)	(639)
Net intangible assets	$ 271	$ 298

For an unclassified balance sheet, the accumulated amortization, as of the reporting date, representing the periodic charge to earnings of deferred costs which are associated with debt obligations existing as of the end of the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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

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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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