SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for doubtful accounts receivable and revenue adjustments
Changes in valuation and qualifying accounts and reserves
Balance at Beginning of Period	$ 4,533	$ 5,249	$ 5,957
Additions, Charged to Costs and Expenses	1,941	2,065	1,524
Additions, Charged to Other Accounts	2,363	39	26
Deductions	3,106	2,820	2,258
Balance at End of Period	5,731	4,533	5,249
Allowance for other accounts receivable
Changes in valuation and qualifying accounts and reserves
Balance at Beginning of Period	1,422	1,334	1,226
Additions, Charged to Costs and Expenses	279	88	108
Balance at End of Period	1,701	1,422	1,334
Allowance for deferred tax assets
Changes in valuation and qualifying accounts and reserves
Balance at Beginning of Period	1,028	2,511	5,644
Additions, Charged to Costs and Expenses			791
Additions, Charged to Other Accounts			47
Deductions	696	1,483	3,971
Balance at End of Period	$ 332	$ 1,028	$ 2,511

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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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