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Acquisitions and Strategic Transaction Expenses EXC (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill, Acquired During Period $ 6,536 $ 0 $ 0
Liabilities Assumed $ (156,881)   $ (3,907)
Excelsior [Member]      
Business Acquisition [Line Items]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     14 years
Business Acquisition, Percentage of Voting Interests Acquired     100.00%
Payments to Acquire Business Two, Net of Cash Acquired     $ 56,786
Payments to Acquire Businesses, Gross     59,500
Sale of assets acquired in acquisition     28,970
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     18,076
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets     254
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent     4,426
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment     3,982
Goodwill, Acquired During Period     4,985
Liabilities Assumed     (3,907)
Business Combination, Consideration Transferred     $ 56,786
Customer Relationships [Member] | Excelsior [Member]      
Business Acquisition [Line Items]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     15 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     $ 7,100
Developed Technology Rights [Member] | Excelsior [Member]      
Business Acquisition [Line Items]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     10 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     $ 3,700
Trade Names [Member] | Excelsior [Member]      
Business Acquisition [Line Items]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     15 years
Finite-lived Intangible Assets Acquired     $ 7,300