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Represents the hypothetical percentage decrease in pre-tax operating margin holding all other assumptions constant used in annual goodwill impairment test.

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Represents the marginal percentage by which the company passed step-one of the annual impairment test.

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Represents the number of locations.

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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 increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount before 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 accumulated impairment loss for 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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Amount of other (increase) decrease 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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Amount of increase (decrease) from foreign currency translation adjustments 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 divestiture 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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Operations and Summary of Significant Accounting Policies - Goodwill (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
Goodwill Impairment Testing
Goodwill	$ 123,881us-gaap_Goodwill				$ 129,218us-gaap_Goodwill				$ 123,881us-gaap_Goodwill	$ 129,218us-gaap_Goodwill	$ 121,981us-gaap_Goodwill
Balance at the beginning of the year
Goodwill	147,961us-gaap_GoodwillGross				152,768us-gaap_GoodwillGross				147,961us-gaap_GoodwillGross	152,768us-gaap_GoodwillGross	145,531us-gaap_GoodwillGross
Accumulated impairment losses	(24,080)				(23,550)				(24,080)	(23,550)	(23,550)
Goodwill at the beginning of the period, net				129,218us-gaap_Goodwill				121,981us-gaap_Goodwill	129,218us-gaap_Goodwill	121,981us-gaap_Goodwill
Goodwill acquired										1,592us-gaap_GoodwillAcquiredDuringPeriod
Goodwill disposed										(480)
Foreign exchange									(4,728)us-gaap_GoodwillTranslationAdjustments	872us-gaap_GoodwillTranslationAdjustments
Impairment	(38)us-gaap_GoodwillImpairmentLoss	(492)us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	(530)us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	(2,346)us-gaap_GoodwillImpairmentLoss
Reclassifications									(79)us-gaap_GoodwillOtherChanges	5,253us-gaap_GoodwillOtherChanges
Balance at the end of the year
Goodwill	147,961us-gaap_GoodwillGross				152,768us-gaap_GoodwillGross				147,961us-gaap_GoodwillGross	152,768us-gaap_GoodwillGross	145,531us-gaap_GoodwillGross
Accumulated impairment losses	(24,080)				(23,550)				(24,080)	(23,550)	(23,550)
Goodwill at the end of the period, net	123,881us-gaap_Goodwill				129,218us-gaap_Goodwill				123,881us-gaap_Goodwill	129,218us-gaap_Goodwill	121,981us-gaap_Goodwill
Bierbach GmbH and Co KG
Balance at the beginning of the year
Impairment		(500)
United States
Goodwill Impairment Testing
Number of locations into which the activities will be consolidated									4
Australia
Goodwill Impairment Testing
Number of locations into which the activities will be consolidated									3
S&P Clever
Goodwill Impairment Testing
Number of locations into which the activities will be consolidated									8
Marginal percentage by which the company passed annual impairment test									8.00%
Goodwill	17,500								17,500
Margin by which the reporting units passed the annual goodwill impairment test
Pre-Tax Operating Margin Decreases (as a percent)									9.00%
Balance at the end of the year
Goodwill at the end of the period, net	17,500								17,500
Denmark
Goodwill Impairment Testing
Number of locations into which the activities will be consolidated									2
North America
Goodwill Impairment Testing
Goodwill	84,526				84,822				84,526	84,822
Balance at the beginning of the year
Goodwill	95,192				95,488				95,192	95,488	89,405
Accumulated impairment losses	(10,666)				(10,666)				(10,666)	(10,666)	(10,666)
Goodwill at the beginning of the period, net				84,822				78,739	84,822	78,739
Goodwill acquired										918
Goodwill disposed										(480)
Foreign exchange									(296)	(248)
Impairment									0
Reclassifications									0	5,893
Balance at the end of the year
Goodwill	95,192				95,488				95,192	95,488	89,405
Accumulated impairment losses	(10,666)				(10,666)				(10,666)	(10,666)	(10,666)
Goodwill at the end of the period, net	84,526				84,822				84,526	84,822
Europe
Goodwill Impairment Testing
Goodwill	37,788				42,690				37,788	42,690	41,263
Balance at the beginning of the year
Goodwill	51,202				55,574				51,202	55,574	54,147
Accumulated impairment losses	(13,414)				(12,884)				(13,414)	(12,884)	(12,884)
Goodwill at the beginning of the period, net				42,690				41,263	42,690	41,263
Goodwill acquired										674
Goodwill disposed										0
Foreign exchange									(4,293)	1,393
Impairment									(530)		(2,346)
Reclassifications									(79)	(640)
Balance at the end of the year
Goodwill	51,202				55,574				51,202	55,574	54,147
Accumulated impairment losses	(13,414)				(12,884)				(13,414)	(12,884)	(12,884)
Goodwill at the end of the period, net	37,788				42,690				37,788	42,690	41,263
Asia/Pacific
Goodwill Impairment Testing
Goodwill	1,567				1,706				1,567	1,706
Balance at the beginning of the year
Goodwill	1,567				1,706				1,567	1,706	1,979
Accumulated impairment losses	0								0		0
Goodwill at the beginning of the period, net				1,706				1,979	1,706	1,979
Goodwill acquired										0
Goodwill disposed										0
Foreign exchange									(139)	(273)
Impairment									0
Reclassifications									0	0
Balance at the end of the year
Goodwill	1,567				1,706				1,567	1,706	1,979
Accumulated impairment losses	0								0		0
Goodwill at the end of the period, net	$ 1,567				$ 1,706				$ 1,567	$ 1,706