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Revenue Impact of ASC 606 in Current Period Balance Sheet (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | [1]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Prepaid expenses and other current assets | $ 32,406,000 | $ 41,286,000
Increase (Decrease) in Prepaid Expense and Other Assets | 3,123,000 |
Accrued liabilities | 116,448,000 | 132,064,000
Increase (Decrease) in Accrued Liabilities | 13,484,000 |
DEFERRED INCOME TAXES | 20,073,000 | $ 24,775,000
Deferred Tax Liabilities, Tax Deferred Income | 1,999,000 |
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 | 35,529,000 |
Accrued liabilities | 129,932,000 |
DEFERRED INCOME TAXES | $ 22,072,000 |
[1] | December 31, 2017 balances were derived from audited consolidated financial statements.

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