Long-Term Debt (Narrative) (Details)
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3 Months Ended |
9 Months Ended |
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Nov. 30, 2016
USD ($)
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Sep. 30, 2017
USD ($)
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Sep. 30, 2016
USD ($)
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Sep. 30, 2017
USD ($)
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Sep. 30, 2016
USD ($)
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Dec. 31, 2016
USD ($)
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| Debt Covenant To Actual Ratios [Line Items] |
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| Revolving credit facility, maximum borrowing capacity |
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$ 300,000,000
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$ 300,000,000
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| Revolving credit facility present accordion provisions |
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75,000,000
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75,000,000
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| Accumulated Amortization, Deferred Finance Costs |
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$ 4,366,000
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4,366,000
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$ 4,138,000
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| Amortization of Debt Issuance Costs |
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$ 614,000
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$ 622,000
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| Houston [Member] |
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| Debt Covenant To Actual Ratios [Line Items] |
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| Deferred payments |
$ 2,000,000
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| Term Number Two [Member] |
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| Debt Covenant To Actual Ratios [Line Items] |
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| Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015) |
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3.5
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3.5
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| Ratio Minimum Per Covenant [Member] |
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| Debt Covenant To Actual Ratios [Line Items] |
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| Ratio of earnings to fixed cost obligations (in Ratio) |
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1.2
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1.2
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| Ratio Actual [Member] |
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| Debt Covenant To Actual Ratios [Line Items] |
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| Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015) |
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2.99
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2.99
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| Ratio of earnings to fixed cost obligations (in Ratio) |
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1.89
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1.89
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| Revolving Credit Facility [Member] |
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| Debt Covenant To Actual Ratios [Line Items] |
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| Revolving credit facility, maximum borrowing capacity |
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$ 150,000,000
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$ 150,000,000
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| Term Loan [Member] |
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| Debt Covenant To Actual Ratios [Line Items] |
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| Revolving credit facility, maximum borrowing capacity |
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150,000,000
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150,000,000
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| Credit Agreement [Member] |
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| Debt Covenant To Actual Ratios [Line Items] |
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| Amortization of Debt Issuance Costs |
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100,000
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$ 100,000
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200,000
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$ 300,000
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| Credit Agreement [Member] | Revolving Credit Facility [Member] |
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| Debt Covenant To Actual Ratios [Line Items] |
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| Amount drawn under term loan facility |
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$ 75,500,000
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$ 75,500,000
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| Credit Agreement [Member] | Revolving Credit Facility [Member] | QTD [Member] |
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| Debt Covenant To Actual Ratios [Line Items] |
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| Weighted average interest rate |
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3.40%
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3.10%
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| Credit Agreement [Member] | Term Loan [Member] |
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| Debt Covenant To Actual Ratios [Line Items] |
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| Amount drawn under term loan facility |
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$ 130,300,000
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$ 130,300,000
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| Debt Instrument, Basis Spread on Variable Rate |
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2.125%
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| Prime Rate Option [Member] | Line of Credit [Member] |
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| Debt Covenant To Actual Ratios [Line Items] |
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| Debt Instrument, Basis Spread on Variable Rate |
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1.125%
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| Libor Margin Option [Member] | Line of Credit [Member] |
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| Debt Covenant To Actual Ratios [Line Items] |
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| Debt Instrument, Basis Spread on Variable Rate |
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2.125%
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