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Revenue Impact of ASC 606 in Current Period Balance Sheet (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | [1]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Prepaid expenses and other current assets | $ 28,742 | $ 41,286
Increase (Decrease) in Prepaid Expense and Other Assets | 4,143 |
Accrued liabilities | 111,280 | 132,064
Increase (Decrease) in Accrued Liabilities | 21,656 |
DEFERRED INCOME TAXES | 19,584 | $ 24,775
Deferred Tax Liabilities, Tax Deferred Income | 1,999 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Prepaid expenses and other current assets | 32,885 |
Accrued liabilities | 132,936 |
DEFERRED INCOME TAXES | $ 21,583 |
[1] | December 31, 2017 balances were derived from audited consolidated financial statements.

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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