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Notes Payable (Details) - USD ($)	1 Months Ended			12 Months Ended
	Nov. 30, 2017	Mar. 31, 2017	Jan. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 05, 2013
Debt Instruments [Abstract]
Aggregate principal payment due in 2019				$ 1,434,000
Aggregate principal payment due in 2020				402,000
Gain on derecognition of debt				1,846,000	$ 0	$ 0
Derecognition of debt, net after tax				$ 1,400,000
Derecognition of debt, net after tax (in dollars per share)				$ 0.11
Notes Payable [Member]
Debt Instruments [Abstract]
Aggregate amount of notes payable				$ 1,000,000
Aggregate principal payment due in 2019				600,000
Aggregate principal payment due in 2020				$ 400,000
Minimum [Member]
Debt Instruments [Abstract]
Spread on Libor variable rate				1.25%
Spread on variable rate				0.10%
Percentage of unused commitment fee				0.25%
Minimum [Member] | Notes Payable [Member]
Debt Instruments [Abstract]
Average effective interest rate				4.50%
Maximum [Member]
Debt Instruments [Abstract]
Spread on Libor variable rate				2.00%
Spread on variable rate				1.00%
Percentage of unused commitment fee				0.30%
Maximum [Member] | Notes Payable [Member]
Debt Instruments [Abstract]
Average effective interest rate				5.00%
Credit Facility [Member]
Debt Instruments [Abstract]
Revolving credit facility commitment							$ 125,000,000
Revolving credit facility maturity date				Nov. 30, 2021
Remaining revolving credit outstanding				$ 87,000,000
Average effective interest rate				4.10%
Credit Agreement [Member]
Debt Instruments [Abstract]
Cash and noncash consideration with respect to acquisition after amendment			$ 50,000,000
Credit Agreement [Member] | Maximum [Member]
Debt Instruments [Abstract]
Cash dividends after amendment	$ 20,000,000	$ 15,000,000	$ 10,000,000

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax.

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