Long-Term Debt Long-Term Debt (Senior long-term debt) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Accumulated Amortization, Debt Issuance Costs	$ 4,442	$ 4,138
Principal amount	36,040
Debt Issuance Costs, Net	955	967
Less: current portion	(2,015)	(16,927)
Total long-term debt	33,070	212,154
Notes payable, other \| Acquisition Debt
Debt Instrument [Line Items]
Principal amount	8,940	10,548
Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Principal amount	0	92,000
Revolving Credit Facility \| Line of Credit \| Revolving Credit Facility, Secured, Floating Rate
Debt Instrument [Line Items]
Principal amount	27,100
Credit Facility, Term Note \| Notes payable, other
Debt Instrument [Line Items]
Principal amount	$ 0	$ 127,500

Amount of accumulated amortization of debt issuance costs.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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