SCHEDULE II 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
Valuation and qualifying accounts
Balance at beginning of period	$ 8,605	$ 15,011	$ 11,229
Charged to Cost and Expenses	2,422	2,174	8,754
Deductions	6,608	8,580	4,972
Balance at end of period	4,419	8,605	15,011
Allowance for obsolete and slow moving inventory
Valuation and qualifying accounts
Balance at beginning of period	14,102	11,736	14,011
Charged to Cost and Expenses	7,979	4,535	1,005
Deductions	1,921	2,169	3,280
Balance at end of period	20,160	14,102	11,736
Allowance for deferred tax assets
Valuation and qualifying accounts
Balance at beginning of period	102,418	86,054	76,056
Charged to Cost and Expenses	38,168	31,978	29,132
Deductions	27,591	15,614	19,134
Balance at end of period	$ 112,995	$ 102,418	$ 86,054

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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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- Definition

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- Definition

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