Schedule II - Consolidated Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance For Doubtful Accounts And Sales Allowances [Member]
Valuation and Qualifying Accounts Roll Forward]
Balance at beginning of year	$ 14,992	$ 15,976	$ 10,636
Additions charged to costs and expenses	2,357	1,350	4,573
Deductions	(3,355)	(2,992)	(2,403)
Other changes	(300)	658	3,170
Balance at end of year	13,694	14,992	15,976
Reserve for inventory obsolescence [Member]
Valuation and Qualifying Accounts Roll Forward]
Balance at beginning of year	43,452	41,967	35,224
Additions charged to costs and expenses	8,621	11,360	14,736
Deductions	(11,833)	(9,696)	(8,253)
Other changes	(1,361)	(179)	260
Balance at end of year	$ 38,879	$ 43,452	$ 41,967

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Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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