Property Plant and Equipment, net (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 331,654,000us-gaap_PropertyPlantAndEquipmentGross	$ 315,790,000us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation	(183,829,000)	(167,282,000)
Property, plant and equipment, net	147,825,000us-gaap_PropertyPlantAndEquipmentNet	148,508,000us-gaap_PropertyPlantAndEquipmentNet
Depreciation expense	23,800,000us-gaap_Depreciation	20,800,000us-gaap_Depreciation	18,800,000us-gaap_Depreciation
Capital Leased Assets, Gross	1,500,000us-gaap_CapitalLeasedAssetsGross
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	12,873,000	12,357,000
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	79,477,000	70,992,000
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	17,341,000	16,480,000
Machinery, office furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	216,527,000	182,897,000
Construction in process [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 5,436,000	$ 33,064,000

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.14)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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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.

+ References

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

-Publisher FASB

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