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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% |  |

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