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Commitments and Contingencies Commitments and Contingencies (Non-Compete, Consulting and Employment Agreements) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Other Commitments [Line Items]  
Other Commitment, Due in Next Twelve Months $ 4,672
Other Commitment, Due in Second Year 3,156
Other Commitment, Due in Third Year 2,745
Other Commitment, Due in Fourth Year 1,789
Other Commitment, Due in Fifth Year 955
Other Commitment, Due after Fifth Year 1,360
Other Commitment 14,677
Noncompete Agreements  
Other Commitments [Line Items]  
Other Commitment, Due in Next Twelve Months 1,745
Other Commitment, Due in Second Year 1,564
Other Commitment, Due in Third Year 1,324
Other Commitment, Due in Fourth Year 1,217
Other Commitment, Due in Fifth Year 837
Other Commitment, Due after Fifth Year 1,360
Other Commitment 8,047
Consulting Agreement [Member]  
Other Commitments [Line Items]  
Other Commitment, Due in Next Twelve Months 907
Other Commitment, Due in Second Year 592
Other Commitment, Due in Third Year 421
Other Commitment, Due in Fourth Year 328
Other Commitment, Due in Fifth Year 118
Other Commitment, Due after Fifth Year 0
Other Commitment 2,366
Employment Agreement [Member]  
Other Commitments [Line Items]  
Other Commitment, Due in Next Twelve Months 2,020
Other Commitment, Due in Second Year 1,000
Other Commitment, Due in Third Year 1,000
Other Commitment, Due in Fourth Year 244
Other Commitment, Due in Fifth Year 0
Other Commitment, Due after Fifth Year 0
Other Commitment $ 4,264
Minimum  
Other Commitments [Line Items]  
Other Commitment, Term of Contract 1 year
Minimum | Noncompete Agreements  
Other Commitments [Line Items]  
Other Commitment, Term of Contract 1 year
Minimum | Consulting Agreement [Member]  
Other Commitments [Line Items]  
Other Commitment, Term of Contract 1 year
Minimum | Employment Agreement [Member]  
Other Commitments [Line Items]  
Other Commitment, Term of Contract 3 years
Maximum  
Other Commitments [Line Items]  
Other Commitment, Term of Contract 12 years
Maximum | Noncompete Agreements  
Other Commitments [Line Items]  
Other Commitment, Term of Contract 10 years
Maximum | Consulting Agreement [Member]  
Other Commitments [Line Items]  
Other Commitment, Term of Contract 10 years
Maximum | Employment Agreement [Member]  
Other Commitments [Line Items]  
Other Commitment, Term of Contract 4 years