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Financial Instruments (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liability	$ 14,400,000
Expense related to increase in fair value of future expected contingent consideration	0	$ 0
Reported Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition-related contingent consideration, including current portion	16,584,000		$ 2,960,000
Long-term debt	273,055,000		265,571,000
Total	289,639,000		268,531,000
Level 1 | Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition-related contingent consideration, including current portion	0		0
Long-term debt	0		0
Total	0		0
Level 2 | Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition-related contingent consideration, including current portion	0		0
Long-term debt	380,362,000		291,837,000
Total	380,362,000		291,837,000
Level 3 | Estimate of Fair Value Measurement
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Acquisition-related contingent consideration, including current portion	16,584,000		2,960,000
Long-term debt	0		0
Total	$ 16,584,000		$ 2,960,000

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Asset Acquisition, Contingent Consideration, Liability

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Amount of liability recognized arising from contingent consideration in a business combination.

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