Debt Obligations (Narrative) (Details) $ in Thousands	3 Months Ended
Mar. 31, 2017 USD ($) aircrafts	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Long term obligations	$ 508,417	$ 458,721
Debt Issuance Costs, Line of Credit Arrangements, Net	$ 700	600
Unsubordinated term loan and Revolving credit facility [Member]
Debt Instrument [Line Items]
Collateral coverage percentage	125.00%
Unsubordinated term loan [Member]
Debt Instrument [Line Items]
Long term obligations	$ 81,765	85,636
Additional Indebtedness Long-Term Debt	$ 150,000
Variable interest rate	2.99%
Revolving credit facility [Member]
Debt Instrument [Line Items]
Long term obligations	$ 415,000	355,000
Accordion feature amount	100,000
Increased borrowing capacity	120,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 545,000
Variable interest rate	2.99%
Credit facility, revolving credit loan, remaining borrowing capacity	$ 121,100
Letters of credit outstanding	8,900
Aircraft loans [Member]
Debt Instrument [Line Items]
Long term obligations	$ 11,652	$ 18,085
Collateralized property (in aircrafts) \| aircrafts	3
Balloon payment percentage	20.00%
Maximum [Member] \| Unsubordinated term loan and Revolving credit facility [Member]
Debt Instrument [Line Items]
Collateral coverage percentage	150.00%
Maximum amount of common stock authorized for repurchase	$ 75,000
Maximum [Member] \| Aircraft loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Basis for Effective Rate	0.0706
Minimum [Member] \| Unsubordinated term loan and Revolving credit facility [Member]
Debt Instrument [Line Items]
Collateral coverage percentage	50.00%
Minimum [Member] \| Aircraft loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Basis for Effective Rate	0.0674

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Collateralized Property Units

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Debt Instrument, Collateral, Coverage Percentage

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Line of Credit Facility, Accordion Feature Amount

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Description of any adjustments made to the stated rate to determine the effective rate.

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Amount, after accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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