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Long-Term Debt (Narrative) (Details)		3 Months Ended		6 Months Ended
	Nov. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Debt Covenant To Actual Ratios [Line Items]
Revolving credit facility, maximum borrowing capacity		$ 300,000,000		$ 300,000,000
Revolving credit facility present accordion provisions		75,000,000		75,000,000
Accumulated Amortization, Deferred Finance Costs		$ 4,290,000		4,290,000		$ 4,138,000
Amortization of Debt Issuance Costs				$ 408,000	$ 420,000
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		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		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)		2.75		2.75
Ratio of earnings to fixed cost obligations (in Ratio)		2.01		2.01
Revolving Credit Facility [Member]
Debt Covenant To Actual Ratios [Line Items]
Revolving credit facility, maximum borrowing capacity		$ 150,000,000		$ 150,000,000
Term Loan [Member]
Debt Covenant To Actual Ratios [Line Items]
Revolving credit facility, maximum borrowing capacity		150,000,000		150,000,000
Credit Agreement [Member]
Debt Covenant To Actual Ratios [Line Items]
Amortization of Debt Issuance Costs		100,000	$ 100,000	200,000	$ 200,000
Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Covenant To Actual Ratios [Line Items]
Amount drawn under term loan facility		$ 62,100,000		$ 62,100,000
Credit Agreement [Member] | Revolving Credit Facility [Member] | QTD [Member]
Debt Covenant To Actual Ratios [Line Items]
Weighted average interest rate		3.10%		3.00%
Credit Agreement [Member] | Term Loan [Member]
Debt Covenant To Actual Ratios [Line Items]
Amount drawn under term loan facility		$ 133,100,000		$ 133,100,000
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				1.125%
Libor Margin Option [Member] | Line of Credit [Member]
Debt Covenant To Actual Ratios [Line Items]
Debt Instrument, Basis Spread on Variable Rate				2.125%

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- Definition

The amount drawn under term loan facility.

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

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

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