Additional Indebtedness Long-Term Debt

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- Definition

Collateralized Property Units

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No definition available.

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- Definition

Debt Instrument, Collateral, Coverage Percentage

+ References

No definition available.

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- Definition

Debt Instrument, Covenant Limitation on Common Stock Repurchase Amount

+ References

No definition available.

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- Definition

Debt Instrument, Periodic Payment Terms, Balloon Payment Percentage

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No definition available.

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- Definition

Line of Credit Facility, Accordion Feature Amount

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No definition available.

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- Definition

Line of Credit Facility, Increased Borrowing Capacity

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

The average effective interest rate during the reporting period.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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.

+ References

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- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

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.

+ References

+ Details

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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Period Type:	instant

- Definition

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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-SubTopic 210
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Debt Obligations (Narrative) (Details) $ in Thousands	12 Months Ended
Debt Obligations (Narrative) (Details) $ in Thousands	Dec. 31, 2016 USD ($) aircrafts	Dec. 31, 2015 USD ($)	May 30, 2016 USD ($)
Debt Instrument [Line Items]
Long term obligations	$ 458,721	$ 317,658
Debt Issuance Costs, Line of Credit Arrangements, Net	$ 600	500
Unsubordinated term loan and Revolving credit facility [Member]
Debt Instrument [Line Items]
Collateral coverage percentage	150.00%
Unsubordinated term loan [Member]
Debt Instrument [Line Items]
Long term obligations	$ 85,636	100,708
Additional Indebtedness Long-Term Debt			$ 150,000
Variable interest rate	2.77%
Revolving credit facility [Member]
Debt Instrument [Line Items]
Long term obligations	$ 355,000	180,000
Accordion feature amount			100,000
Increased borrowing capacity			100,000
Line of Credit Facility, Maximum Borrowing Capacity			$ 425,000
Variable interest rate	2.77%
Credit facility, revolving credit loan, remaining borrowing capacity	$ 61,500
Letters of credit outstanding	8,500
Aircraft loans [Member]
Debt Instrument [Line Items]
Long term obligations	$ 18,085	$ 36,950
Collateralized property (in aircrafts) \| aircrafts	4
Balloon payment percentage		20.00%
Maximum [Member] \| Unsubordinated term loan and Revolving credit facility [Member]
Debt Instrument [Line Items]
Collateral coverage percentage	175.00%
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