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Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |  |  |  |
Balance at Beginning of Period | $ 4,327 us-gaap_ValuationAllowancesAndReservesBalance |  | $ 3,045 us-gaap_ValuationAllowancesAndReservesBalance |  | $ 3,588 us-gaap_ValuationAllowancesAndReservesBalance |
Additions Charged to Costs and Expenses | 896 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |  | 1,413 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |  | 745 us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense |
Additions Recorded During Acquisitions | 0 us-gaap_ValuationAllowancesAndReservesAdjustments |  | 0 us-gaap_ValuationAllowancesAndReservesAdjustments |  | 0 us-gaap_ValuationAllowancesAndReservesAdjustments |
Deductions | 1,385 us-gaap_ValuationAllowancesAndReservesDeductions | [1] | 130 us-gaap_ValuationAllowancesAndReservesDeductions | [1] | 1,288 us-gaap_ValuationAllowancesAndReservesDeductions | [1]
Balance at End of Period | $ 3,838 us-gaap_ValuationAllowancesAndReservesBalance |  | $ 4,327 us-gaap_ValuationAllowancesAndReservesBalance |  | $ 3,045 us-gaap_ValuationAllowancesAndReservesBalance |
[1] | Accounts written off, net of recoveries.

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- Definition Total of the adjustments in a given period to 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. + 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 + Details
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- Definition 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 + Details
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- Definition 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, charged to costs and expenses. + 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 + Details
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- Definition Total of the deductions in a given period to 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, representing receivables written off as uncollectible and portions of the reserves utilized, respectively. + 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 + Details
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