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Long-Term Debt (Narrative) (Details)		3 Months Ended
	Nov. 30, 2016 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Debt Covenant To Actual Ratios [Line Items]
Revolving credit facility, maximum borrowing capacity		$ 300,000,000
Revolving credit facility present accordion provisions		75,000,000
Accumulated Amortization, Deferred Finance Costs		4,518,000		$ 4,442,000
Amortization of Debt Issuance Costs		$ 208,000	$ 203,000
Houston [Member]
Debt Covenant To Actual Ratios [Line Items]
Deferred payments	$ 2,000,000
Term Number Two [Member]
Debt Covenant To Actual Ratios [Line Items]
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015)		3.5
Ratio Minimum Per Covenant [Member]
Debt Covenant To Actual Ratios [Line Items]
Ratio of earnings to fixed cost obligations (in Ratio)		1.2
Ratio Actual [Member]
Debt Covenant To Actual Ratios [Line Items]
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015)		2.96
Ratio of earnings to fixed cost obligations (in Ratio)		2.04
Revolving Credit Facility [Member]
Debt Covenant To Actual Ratios [Line Items]
Revolving credit facility, maximum borrowing capacity		$ 150,000,000
Term Loan [Member]
Debt Covenant To Actual Ratios [Line Items]
Revolving credit facility, maximum borrowing capacity		150,000,000
Credit Agreement [Member]
Debt Covenant To Actual Ratios [Line Items]
Amortization of Debt Issuance Costs		100,000	$ 100,000
Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Covenant To Actual Ratios [Line Items]
Amount drawn under term loan facility		$ 84,200,000
Credit Agreement [Member] | Revolving Credit Facility [Member] | QTD [Member]
Debt Covenant To Actual Ratios [Line Items]
Weighted average interest rate		3.90%
Credit Agreement [Member] | Term Loan [Member]
Debt Covenant To Actual Ratios [Line Items]
Amount drawn under term loan facility		$ 123,800,000
Debt Instrument, Basis Spread on Variable Rate		2.125%
Prime Rate Option [Member] | Line of Credit [Member]
Debt Covenant To Actual Ratios [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.625%
Libor Margin Option [Member] | Line of Credit [Member]
Debt Covenant To Actual Ratios [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.625%

X

- Definition

The amount drawn under term loan facility.

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Business Combination, Present Value of Deferred Payment, Liability

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X

- Definition

Additional borrowing capacity under the credit facility's accordion feature providing the right to increase the line of credit borrowing capacity.

+ References

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- Definition

Amount of accumulated amortization of debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
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Amount of amortization expense attributable to debt issuance costs.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The average effective interest rate during the reporting period.

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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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- Definition

Indebtedness divided by net capital.

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