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QUARTERLY FINANCIAL DATA (UNAUDITED) (NARRATIVE) (DETAILS) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loss on assets held-for-sale |  |  |  |  |  |  |  |  | $ 2,578 |  |
Interest Expense. |  |  |  |  |  |  |  |  | 13,734 | $ 7,943 | $ 7,538
Taxes related to US tax reform | $ 62,400 |  |  |  |  |  |  |  | $ 61,569 |  | 0
Benefit to Income Taxes Related to Restructuring Charges | 1,900 | $ 2,400 | $ 1,500 |  | $ 200 | $ 1,300 |  |  |  |  |
Net Change in Valuation Allowance | 600 |  |  |  | 400 |  | $ 1,000 | $ 100 |  |  |
Benefit to Income Taxes Related to Impairments | 1,900 |  |  |  | 8,300 | 1,500 |  |  |  |  |
Benefit to Income Taxes Related to Dispositon of Assets |  |  | 1,300 |  |  |  |  |  |  |  |
Expense to Income Taxes Related to Dispositon of Assets | 400 | 1,300 |  |  |  |  |  |  |  |  |
Tax Adjustments, Settlements, and Unusual Provisions | 300 | (200) | 700 | $ (300) |  |  |  |  |  |  |
Expense to Income Taxes Related to Uncertain Tax Position |  |  |  |  | 400 | $ 600 | $ 700 |  |  |  |
Expense Related to Tax Rate Changes |  |  |  |  | $ 500 |  |  |  |  |  |
Excess tax benefit from equity-based awards | 200 | $ 1,000 | $ 700 | $ 300 |  |  |  |  |  | $ 557 | $ (823)
Connextions |  |  |  |  |  |  |  |  |  |  |
Interest Expense. | 5,250 |  |  |  |  |  |  |  |  |  |
Motif [Member] |  |  |  |  |  |  |  |  |  |  |
Interest Expense. | $ 1,200 |  |  |  |  |  |  |  |  |  |

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