Collateralized Property Units

No definition available.

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- Definition

Convertible note hedge fair value

+ References

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

Gain/Loss on fair value of convertible hedge asset

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No definition available.

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- Definition

Gain/loss on fair value of note conversion obligation

+ References

No definition available.

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- Definition

Line of Credit Facility, Accordion Feature Amount

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Line of Credit Facility, Increased Borrowing Capacity

+ References

No definition available.

+ Details

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Balance Type:	credit
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- Definition

Note conversion obligation fair value

+ References

No definition available.

+ Details

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- Definition

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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- Definition

Dividend or interest rate associated with the financial instrument issued in exchange for the original debt being converted in a noncash or part noncash transaction. Noncash are transactions that affect recognized assets or liabilities but that do not result in cash receipts or cash payments. Part noncash refers to that portion of the transaction not resulting in cash receipts or cash payments.

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- Definition

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

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- Definition

The average effective interest rate during the reporting period.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

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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 discount.

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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.

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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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- 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

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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

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- 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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

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- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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Debt Obligations (Narrative) (Details) $ in Thousands	12 Months Ended
Debt Obligations (Narrative) (Details) $ in Thousands	Dec. 31, 2017 USD ($) aircrafts	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 25, 2017 USD ($)	Mar. 31, 2017 USD ($)
Debt Instrument [Line Items]
Long term obligations	$ 515,758	$ 458,721
Debt Issuance Costs, Line of Credit Arrangements, Net	700	600
Convertible Debt	196,550	0
Note conversion obligation fair value	(54,359)	0
Gain/loss on fair value of note conversion obligation	(3,000)
Proceeds from Convertible Debt	258,750	0	$ 0
Convertible note hedge fair value	53,683	0
Gain/Loss on fair value of convertible hedge asset	$ (2,400)
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	$ 70,568	85,636
Variable interest rate	3.07%
Revolving credit facility [Member]
Debt Instrument [Line Items]
Long term obligations	$ 245,000	355,000
Accordion feature amount					$ 100,000
Increased borrowing capacity					$ 120,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 545,000
Variable interest rate	3.07%
Credit facility, revolving credit loan, remaining borrowing capacity	$ 290,700
Letters of credit outstanding	9,300
Aircraft loans [Member]
Debt Instrument [Line Items]
Long term obligations	$ 3,640	$ 18,085
Collateralized property (in aircrafts) \| aircrafts	1
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	$ 100,000
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
Convertible Debt [Member]
Debt Instrument [Line Items]
Convertible Debt	$ 258,750			$ 258,750
Debt Conversion, Converted Instrument, Rate	0.00%
Debt Instrument, Interest Rate, Effective Percentage	0.00%
Proceeds from Convertible Debt	$ 252,281
Warrants and Rights Outstanding	38,502
Unamortized Debt Issuance Expense	(6,685)
Debt Instrument, Unamortized Discount	(55,515)
Fair Value, Measurements, Recurring [Member]
Debt Instrument [Line Items]
Note conversion obligation fair value	54,359
Convertible note hedge fair value	53,683
Fair Value, Inputs, Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Debt Instrument [Line Items]
Note conversion obligation fair value	54,359			(57,369)
Convertible note hedge fair value	$ 53,683			$ 56,097