CONDENSED CONSOLIDATING FINANCIAL INFORMATION (Tables)

6 Months Ended

Jun. 30, 2013

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Condensed Consolidating Balance Sheets

	June 30, 2013
	Parent Company Only (issuer)			Guarantor Subsidiaries  (1)		Eliminations			Consolidated
ASSETS
Current Assets:
Cash	$	1,157		$	11,033	$	—		$	12,190
Short-term investments		76,214			—		—			76,214
Accounts receivable – net		89,105			68,473		—			157,578
Intercompany receivable		126,255			—		(126,255	)		—
Inventories of spare parts – net		67,277			126		—			67,403
Prepaid expenses		9,244			2,249		—			11,493
Work in progress		77,921			—		—			77,921
Deferred income taxes		11,966			—		—			11,966
Income taxes receivable		1,393			231		—			1,624
Total current assets		460,532			82,112		(126,255	)		416,389
Investment in subsidiaries		108,241			—		(108,241	)		—
Property and equipment – net		556,665			200,263		—			756,928
Restricted investments		14,685			—		—			14,685
Other assets		15,503			350		—			15,853
Total assets	$	1,155,626		$	282,725	$	(234,496	)	$	1,203,855
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current Liabilities:
Accounts payable	$	33,519		$	7,235	$	—		$	40,754
Accrued and other current liabilities		109,387			12,724		—			122,111
Intercompany payable		—			126,255		(126,255	)		—
Total current liabilities		142,906			146,214		(126,255	)		162,865
Long-term debt		375,723			—		—			375,723
Deferred income taxes and other long-term liabilities		109,094			28,270		—			137,364
Shareholders’ Equity:
Common stock and paid-in capital		297,076			2,674		(2,674	)		297,076
Accumulated other comprehensive loss		(80	)		—		—			(80	)
Retained earnings		230,907			105,567		(105,567	)		230,907
Total shareholders’ equity		527,903			108,241		(108,241	)		527,903
Total liabilities and shareholders’ equity	$	1,155,626		$	282,725	$	(234,496	)	$	1,203,855

(1) Foreign subsidiaries represent minor subsidiaries and are included in the guarantors’ subsidiaries amounts.

	December 31, 2012
	Parent Company Only (issuer)			Guarantor Subsidiaries  (1)		Eliminations			Consolidated
ASSETS
Current Assets:
Cash	$	552		$	2,297	$	—		$	2,849
Short-term investments		50,601			—		—			50,601
Accounts receivable – net		80,148			61,005		—			141,153
Intercompany receivable		115,300			—		(115,300	)		—
Inventories of spare parts – net		65,951			123		—			66,074
Prepaid expenses		8,354			1,783		—			10,137
Work in progress		77,764			—		—			77,764
Other current assets		988			—		—			988
Deferred income taxes		11,967			—		—			11,967
Income taxes receivable		1,395			218		—			1,613
Total current assets		413,020			65,426		(115,300	)		363,146
Investment in subsidiaries		96,706			—		(96,706	)		—
Property and equipment, net		559,686			189,815		—			749,501
Restricted investments		14,685			—		—			14,685
Other assets		19,726			836		—			20,562
Total assets	$	1,103,823		$	256,077	$	(212,006	)	$	1,147,894
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current Liabilities:
Accounts payable	$	21,188		$	5,120	$	—		$	26,308
Accrued and other current liabilities		105,875			11,287		—			117,162
Intercompany payable		—			115,300		(115,300	)		—
Total current liabilities		127,063			131,707		(115,300	)		143,470
Long-term debt		386,755			—		—			386,755
Deferred income taxes and other long-term liabilities		90,390			27,664		—			118,054
Shareholders’ Equity:
Common stock and paid-in capital		297,113			2,674		(2,674	)		297,113
Accumulated other comprehensive loss		(51	)		—		—			(51	)
Retained earnings		202,553			94,032		(94,032	)		202,553
Total shareholders’ equity		499,615			96,706		(96,706	)		499,615
Total liabilities and shareholders’ equity	$	1,103,823		$	256,077	$	(212,006	)	$	1,147,894

(1) Foreign subsidiaries represent minor subsidiaries and are included in the guarantors’ subsidiaries amounts.

Condensed Consolidating Statements of Operations

	For the quarter ended June 30, 2013
	Parent Company Only			Guarantor Subsidiaries (1)		Eliminations			Consolidated
Operating revenues, net	$	116,808		$	78,735	$	—		$	195,543
Expenses:
Direct expenses		96,106			63,388		—			159,494
Selling, general and administrative expenses		8,022			2,002		—			10,024
Management fees		(5,809	)		5,809		—			—
Total operating expenses		98,319			71,199		—			169,518
Gain on disposal of assets, net		(14,701	)		—		—			(14,701	)
Impairment of assets		—			421		—			421
Equity in loss of unconsolidated affiliate		596			—		—			596
Operating income		32,594			7,115		—			39,709
Equity in net income of consolidated subsidiaries		(4,522	)		—		4,522			—
Interest expense		7,257			—		—			7,257
Other income, net		(73	)		—		—			(73	)
		2,662			—		4,522			7,184
Earnings before income taxes		29,932			7,115		(4,522	)		32,525
Income tax expense		10,163			2,846		—			13,009
Net earnings	$	19,769		$	4,269	$	(4,522	)	$	19,516
	For the quarter ended June 30, 2012
	Parent Company Only			Guarantor Subsidiaries  (1)		Eliminations			Consolidated
Operating revenues, net	$	102,270		$	58,284	$	—		$	160,554
Expenses:
Direct expenses		88,551			45,537		—			134,088
Selling, general and administrative expenses		7,861			1,811		—			9,672
Management fees		(2,331	)		2,331		—			—
Total operating expenses		94,081			49,679		—			143,760
Gain on disposal of assets, net		(679	)		—		—			(679	)
Operating income		8,868			8,605		—			17,473
Equity in net income of consolidated subsidiaries		(5,156	)		—		5,156			—
Interest expense		7,428			12		—			7,440
Other income, net		(57	)		—		—			(57	)
		2,215			12		5,156			7,383
Earnings before income taxes		6,653			8,593		(5,156	)		10,090
Income tax expense		599			3,437		—			4,036
Net earnings	$	6,054		$	5,156	$	(5,156	)	$	6,054

(1) Foreign subsidiaries represent minor subsidiaries and are included in the guarantors’ subsidiaries amounts.

	For the six months ended June 30, 2013
	Parent Company Only			Guarantor Subsidiaries  (1)		Eliminations			Consolidated
Operating revenues, net	$	229,293		$	145,218	$	—		$	374,511
Expenses:
Direct expenses		186,992			120,705		—			307,697
Selling, general and administrative expenses		14,354			3,936		—			18,290
Management fees		(5,809	)		5,809		—			—
Total operating expenses		195,537			130,450		—			325,987
Gain on disposal of assets, net		(14,676	)		—		—			(14,676	)
Impairment of assets		—			421		—			421
Equity in loss of unconsolidated affiliate		1,083			—		—			1,083
Operating income		47,349			14,347		—			61,696
Equity in net income of consolidated subsidiaries		(8,861	)		—		8,861			—
Interest expense		14,666			—		—			14,666
Other income, net		(225	)		—		—			(225	)
		5,580			—		8,861			14,441
Earnings before income taxes		41,769			14,347		(8,861	)		47,255
Income tax expense		13,162			5,739		—			18,901
Net earnings	$	28,607		$	8,608	$	(8,861	)	$	28,354
	For the six months ended June 30, 2012
	Parent Company Only			Guarantor Subsidiaries  (1)		Eliminations			Consolidated
Operating revenues, net	$	194,368		$	104,237	$	—		$	298,605
Expenses:
Direct expenses		167,815			84,975		—			252,790
Selling, general and administrative expenses		14,947			3,561		—			18,508
Management fees		(4,169	)		4,169		—			—
Total operating expenses		178,593			92,705		—			271,298
Gain on disposal of assets, net		(690	)		—		—			(690	)
Operating income		16,465			11,532		—			27,997
Equity in net income of consolidated subsidiaries		(6,912	)		—		6,912			—
Interest expense		14,628			12		—			14,640
Other income, net		(363	)		—		—			(363	)
		7,353			12		6,912			14,277
Earnings before income taxes		9,112			11,520		(6,912	)		13,720
Income tax expense		880			4,608		—			5,488
Net earnings	$	8,232		$	6,912	$	(6,912	)	$	8,232

(1) Foreign subsidiaries represent minor subsidiaries and are included in the guarantors’ subsidiaries amounts.

Condensed Consolidated Statements of Comprehensive Income

	For the quarter ended June 30, 2013
	Parent Company Only			Guarantor Subsidiaries  (1)		Eliminations			Consolidated
Net earnings	$	19,516		$	4,522	$	(4,522	)	$	19,516
Unrealized loss on short-term investments		(42	)		—		—			(42	)
Changes in pension plan assets and benefit obligations		(2	)		—		—			(2	)
	$	19,472		$	4,522	$	(4,522	)	$	19,472
	For the quarter ended June 30, 2012
	Parent Company Only			Guarantor Subsidiaries  (1)		Eliminations			Consolidated
Net earnings	$	6,054		$	5,156	$	(5,156	)	$	6,054
Unrealized gain on short-term investments		17			—		—			17
Changes in pension plan assets and benefit obligations		(8	)		—		—			(8	)
	$	6,063		$	5,156	$	(5,156	)	$	6,063

(1) Foreign subsidiaries represent minor subsidiaries and are included in the guarantors’ subsidiaries amounts.

	For the six months ended June 30, 2013
	Parent Company Only			Guarantor Subsidiaries  (1)		Eliminations			Consolidated
Net earnings	$	28,354		$	8,861	$	(8,861	)	$	28,354
Unrealized loss on short-term investments		(23	)		—		—			(23	)
Changes in pension plan assets and benefit obligations		(6	)		—		—			(6	)
	$	28,325		$	8,861	$	(8,861	)	$	28,325

	For the six months ended June 30, 2012
	Parent Company Only			Guarantor Subsidiaries  (1)		Eliminations			Consolidated
Net earnings	$	8,232		$	6,912	$	(6,912	)	$	8,232
Unrealized gain on short-term investments		67			—		—			67
Changes in pension plan assets and benefit obligations		(12	)		—		—			(12	)
	$	8,287		$	6,912	$	(6,912	)	$	8,287

(1) Foreign subsidiaries represent minor subsidiaries and are included in the guarantors’ subsidiaries amounts.

Condensed Consolidating Statements of Cash Flows

	For the six months ended June 30, 2013
	Parent Company Only (issuer)			Guarantor Subsidiaries  (1)		Eliminations		Consolidated
Net cash provided by operating activities	$	48,970		$	8,736	$	—	$	57,706
Investing activities:
Purchase of property and equipment		(50,004	)		—		—		(50,004	)
Proceeds from asset dispositions		37,255			—		—		37,255
Deposits returned on aircraft, net		2,579			—		—		2,579
Purchase of short-term investments		(246,375	)		—		—		(246,375	)
Proceeds from sale of short-term investments, net		220,249			—		—		220,249
Net cash used in investing activities		(36,296	)		—		—		(36,296	)
Financing activities:
Proceeds from line of credit		41,965			—		—		41,965
Payments on line of credit		(52,997	)		—		—		(52,997	)
Repurchase of common stock		(1,037	)		—		—		(1,037	)
Net cash used in financing activities		(12,069	)		—		—		(12,069	)
Increase in cash		605			8,736		—		9,341
Cash, beginning of period		552			2,297		—		2,849
Cash, end of period	$	1,157		$	11,033	$	—	$	12,190
	For the six months ended June 30, 2012
	Parent Company Only (issuer)			Guarantor Subsidiaries  (1)		Eliminations		Consolidated
Net cash provided by operating activities	$	24,288		$	594	$	—	$	24,882
Investing activities:
Purchase of property and equipment		(32,407	)		—		—		(32,407	)
Proceeds from asset dispositions		8,587			—		—		8,587
Deposits paid on aircraft		(9,126	)		—		—		(9,126	)
Purchase of short-term investments, net		(7,594	)		—		—		(7,594	)
Net cash used in investing activities		(40,540	)		—		—		(40,540	)
Financing activities:
Proceeds from line of credit		66,081			—		—		66,081
Payments on line of credit		(54,090	)		—		—		(54,090	)
Net cash provided by financing activities		11,991			—		—		11,991
(Decrease) increase in cash		(4,261	)		594		—		(3,667	)
Cash, beginning of period		4,313			778		—		5,091
Cash, end of period	$	52		$	1,372	$	—	$	1,424

(1) Foreign subsidiaries represent minor subsidiaries and are included in the guarantors’ subsidiaries amounts.