Consolidated fixed charge coverage ratio minimum.

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- Definition

Consolidated leverage ratio maximum.

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- Definition

Minimum consideration for a business consideration, after which maximum consolidated leverage ratio will increase under the credit facility.

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Debt instruments maturity date month and year.

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Line of credit facility accordion feature.

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Amount of amortization expense attributable to debt issuance costs.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the required periodic payments applied to principal.

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Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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Weighted average interest rate of debt outstanding.

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Description of the conditions for borrowing under the credit facility including the nature of any restrictions.

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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 borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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No definition available.

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Debt - Additional Information (Details) - USD ($)					12 Months Ended
Debt - Additional Information (Details) - USD ($)	Dec. 31, 2018	Feb. 26, 2018	Aug. 01, 2017	May 19, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jul. 28, 2017
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 300,000,000
Senior credit facilities maturity period				5 years
Senior credit facilities maturity year				2021-05
Unused commitment fees percentage					0.40%
Maximum consolidated leverage ratio				300.00%
Second amended and restated credit agreement, fourth amendment, covenants				The Second Amended and Restated Credit Agreement also requires the Company to satisfy certain financial covenants, such as maintaining a minimum consolidated fixed charge coverage ratio of 1.50 and a maximum consolidated leverage ratio of 3.00. The maximum consolidated leverage ratio will increase to 3.50 for four consecutive quarters following an acquisition with an aggregate consideration greater than or equal to $50.0 million.
Minimum consolidated fixed charge coverage ratio				150.00%
Long-term debt including current maturities	$ 207,378,000				$ 207,378,000	$ 234,619,000
Debt weighted average interest rate	3.37%				3.37%
Non-cash interest expense related to amortization of deferred financing costs					$ 1,000,000	$ 800,000	$ 900,000
Eurocurrency Rate \| Minimum
Debt Instrument [Line Items]
Variable interest rate					1.75%
Eurocurrency Rate \| Maximum
Debt Instrument [Line Items]
Variable interest rate					2.75%
Base Rate \| Minimum
Debt Instrument [Line Items]
Variable interest rate					0.75%
Base Rate \| Maximum
Debt Instrument [Line Items]
Variable interest rate					1.75%
Term Loan
Debt Instrument [Line Items]
Long-term debt including current maturities	$ 74,525,000				$ 74,525,000
Second Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Maximum consolidated leverage ratio				300.00%
Second Amended and Restated Credit Agreement \| Permitted Acquisitions and Stock Repurchases
Debt Instrument [Line Items]
Maximum consolidated leverage ratio				250.00%
Second Amended and Restated Credit Agreement \| Designated Acquisition
Debt Instrument [Line Items]
Maximum consolidated leverage ratio				300.00%
Second Amended and Restated Credit Agreement \| Four Consecutive Quarters Following Designated Acquisition
Debt Instrument [Line Items]
Maximum consolidated leverage ratio				350.00%
Second Amended and Restated Credit Agreement \| Acquisition with Aggregate Consideration Greater than or Equal to $50 million
Debt Instrument [Line Items]
Maximum consolidated leverage ratio				350.00%
Debt instrument, covenant, required business acquisition consideration, minimum				$ 50,000,000
Second Amended and Restated Credit Agreement \| Term Loan
Debt Instrument [Line Items]
Maximum borrowing capacity				75,000,000
Long-term debt including current maturities								$ 65,600,000
Second Amended and Restated Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 225,000,000
Second Amended and Restated Credit Agreement \| Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Unused commitment fees percentage					0.25%
Second Amended and Restated Credit Agreement \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Unused commitment fees percentage					0.45%
Second Amended and Restated Credit Facility \| Dividend Payments and Stock Repurchases
Debt Instrument [Line Items]
Maximum consolidated leverage ratio				250.00%
Third Amendment to Second Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Senior credit facilities maturity year					2021-05
Debt instrument, frequency of periodic payment					quarterly
Third Amendment to Second Amended and Restated Credit Agreement \| Term Loan
Debt Instrument [Line Items]
Long-term debt including current maturities			$ 90,600,000
Quarterly installments payable on term loan			2,300,000
Debt instrument, final installment amount			56,100,000
Third Amendment to Second Amended and Restated Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			325,000,000
Line of credit facility accordion feature			$ 125,000,000
Available for borrowings capacity	$ 189,900,000				$ 189,900,000
Fourth Amendment to Second Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Maximum consolidated leverage ratio	350.00%
Second amended and restated credit agreement, fourth amendment, covenants		The Fourth Amendment increased the maximum permitted consolidated leverage ratio from 3.00 to 3.50, increased the maximum consolidated leverage ratio for permitted acquisitions and stock repurchases from 2.50 to 3.00, increased the maximum permitted consolidated leverage ratio for a designated acquisition from 3.00 to 3.50, and increased the maximum permitted leverage ratio for four consecutive quarters following a designated acquisition from 3.50 to 4.00.
Fourth Amendment to Second Amended and Restated Credit Agreement \| Permitted Acquisitions and Stock Repurchases
Debt Instrument [Line Items]
Maximum consolidated leverage ratio	300.00%
Fourth Amendment to Second Amended and Restated Credit Agreement \| Designated Acquisition
Debt Instrument [Line Items]
Maximum consolidated leverage ratio	350.00%
Fourth Amendment to Second Amended and Restated Credit Agreement \| Four Consecutive Quarters Following Designated Acquisition
Debt Instrument [Line Items]
Maximum consolidated leverage ratio	400.00%