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Debt Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 22, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Notes Payable   $ 300,000  
Total debt $ 319,477    
Current portion of debt 19,688   $ 14,063
Long-term debt 593,572   290,460
Senior Notes [Member]      
Debt Instrument [Line Items]      
Notes Payable 300,000   0
Debt Issuance Costs, Noncurrent, Net 5,588   0
USD Denominated Term Loan [Member]      
Debt Instrument [Line Items]      
Loans Payable to Bank 194,063   208,125
Debt Issuance Costs, Noncurrent, Net 629   769
Line of Credit [Member]      
Debt Instrument [Line Items]      
Long-term Line of Credit 125,414   97,167
Secured Debt [Member]      
Debt Instrument [Line Items]      
Total debt 619,477   305,292
Current portion of debt 19,688   14,063
Long-term debt $ 593,572   $ 290,460