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Notes Payable (Details) - USD ($)		12 Months Ended
	Jan. 11, 2016	Dec. 31, 2016	Dec. 05, 2013
Debt Instrument [Line Items]
Aggregate principal payment due in 2017		$ 1,227,000
Aggregate principal payment due in 2018		48,750,000
Notes Payable [Member]
Debt Instrument [Line Items]
Aggregate amount of notes payable		1,500,000
Aggregate principal payment due in 2017		694,000
Aggregate principal payment due in 2018		$ 819,000
Minimum [Member]
Debt Instrument [Line Items]
Spread on Libor variable rate		1.50%
Spread on variable rate		0.10%
Percentage of unused commitment fee		0.10%
Minimum [Member] | Notes Payable [Member]
Debt Instrument [Line Items]
Average effective interest rate		3.25%
Maximum [Member]
Debt Instrument [Line Items]
Spread on Libor variable rate		2.50%
Spread on variable rate		1.00%
Percentage of unused commitment fee		0.25%
Maximum [Member] | Notes Payable [Member]
Debt Instrument [Line Items]
Average effective interest rate		3.50%
Credit Agreement [Member]
Debt Instrument [Line Items]
Cash and noncash consideration with respect to acquisition after amendment	$ 50,000,000
Cash dividends after amendment	$ 10,000,000
Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility commitment			$ 125,000,000
Revolving credit facility maturity date		Nov. 30, 2018
Remaining revolving credit outstanding		$ 79,000,000

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
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-Name Accounting Standards Codification
-Topic 210
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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