Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB

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-Topic 350

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The amount of identifiable intangible assets recognized as of the acquisition date.

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

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-Topic 805

-SubTopic 20

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The portion of profit or loss for the period which is attributable to the parent.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Acquisitions - NL Grease, LLC (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 13, 2013
Business Acquisition [Line Items]
Revenues	$ 376,983us-gaap_SalesRevenueNet	$ 377,088us-gaap_SalesRevenueNet	$ 403,261us-gaap_SalesRevenueNet	$ 484,809us-gaap_SalesRevenueNet	$ 467,132us-gaap_SalesRevenueNet	$ 355,578us-gaap_SalesRevenueNet	$ 356,673us-gaap_SalesRevenueNet	$ 433,356us-gaap_SalesRevenueNet	$ 1,642,141us-gaap_SalesRevenueNet	$ 1,612,739us-gaap_SalesRevenueNet	$ 1,490,361us-gaap_SalesRevenueNet
Net income (loss)	4,374us-gaap_IncomeLossAttributableToParent	(26,906)us-gaap_IncomeLossAttributableToParent	(968)us-gaap_IncomeLossAttributableToParent	11,795us-gaap_IncomeLossAttributableToParent	(39,259)us-gaap_IncomeLossAttributableToParent	191us-gaap_IncomeLossAttributableToParent	9,078us-gaap_IncomeLossAttributableToParent	16,636us-gaap_IncomeLossAttributableToParent	(11,705)us-gaap_IncomeLossAttributableToParent	(13,354)us-gaap_IncomeLossAttributableToParent	101,987us-gaap_IncomeLossAttributableToParent
NL Grease, LLC [Member]
Business Acquisition [Line Items]
Intangible and other assets												5,113
Weighted average useful life									6 years
Revenues									14,054	7,875
Net income (loss)									517	(22)
NL Grease, LLC [Member] \| Technology-Based Intangible Assets [Member]
Business Acquisition [Line Items]
Intangible and other assets												2,418
Finite-lived intangible asset useful life									10 years
NL Grease, LLC [Member] \| Customer Lists [Member]
Business Acquisition [Line Items]
Intangible and other assets												2,218
Finite-lived intangible asset useful life									3 years
NL Grease, LLC [Member] \| Noncompete Agreements [Member]
Business Acquisition [Line Items]
Intangible and other assets												477
Finite-lived intangible asset useful life									5 years
NL Grease, LLC [Member] \| Partners' Capital [Member]
Business Acquisition [Line Items]
Intangible and other assets						$ 55