Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities:
Net earnings	$ 25,296	$ 42,131
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	36,906	31,424
Deferred income taxes	9,254	26,158
Loss (gain) on asset dispositions	1,371	(16,075)
Equity in (profit) loss of unconsolidated affiliate	(213)	911
Loss on debt extinguishment	29,833
Impairment of assets		421
Other		655
Changes in operating assets and liabilities	(46,362)	(17,520)
Net cash provided by operating activities	56,085	68,105
Investing activities:
Purchase of property and equipment	(131,478)	(86,092)
Proceeds from asset dispositions	7,171	39,822
Purchase of short-term investments	(439,745)	(314,519)
Proceeds from sale of short-term investments	338,253	287,043
Refund of deposits on aircraft	9,506	6,908
Payments of deposits on aircraft	(6,882)	(2,693)
Other	(175)
Net cash used in investing activities	(223,350)	(69,531)
Financing activities:
Proceeds from issuance of Senior Notes due 2019	500,000
Repayment of Senior Notes due 2018	(300,000)
Premium and costs to retire debt early	(26,749)
Debt issuance costs	(6,232)
Proceeds from line of credit	205,604	101,273
Payments on line of credit	(203,000)	(99,763)
Repurchase of common stock	(176)	(1,037)
Net cash provided by financing activities	169,447	473
Increase (decrease) in cash	2,182	(953)
Cash, beginning of period	934	2,849
Cash, end of period	3,116	1,896
Cash paid during the period for:
Interest	24,896	15,112
Income taxes	9,950	229
Noncash investing activities:
Other current liabilities and accrued payables related to purchase of property and equipment	$ 76	$ 102