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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net income $ 39,976 $ 13,460
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization expense 40,789 40,009
Deferred income tax expense 9,253 6,775
Stock-based compensation 1,513 2,053
Tax benefit from exercise of stock options (1,010) (527)
Loss on disposition of assets, net 1,213 208
Unrealized loss on derivative instrument 64 140
Loss from equity method investee 603  
Changes in assets and liabilities, net of effects of acquisitions:    
Increase in prepaid expenses and other current assets (387) (9,826)
Decrease (increase) in receivables (32,687) 8,335
Decrease (increase) in inventories 2,162 (4,132)
Decrease (increase) in costs in excess of billings 1,375 (708)
Increase (decrease) in accounts payable, other accrued liabilities, and other liabilities 11,929 (2,748)
Decrease in deferred revenue and billings in excess of costs (1,398) (2,298)
Net cash provided by operating activities 73,395 50,741
Cash flows from investing activities:    
Acquisition of subsidiaries (note 2) (3,182)  
Acquisition of property and equipment (65,909) (17,310)
Buy-out of previously leased aircraft (17,296) (36,568)
Proceeds from disposition and sale of equipment and assets held for sale 9,156 10,964
Decrease (increase) in other assets 447 (2,303)
Net cash used in investing activities (76,784) (45,217)
Cash flows from financing activities:    
Proceeds from issuance of common stock, net 479 576
Tax benefit from exercise of stock options 1,010 527
Borrowings under line of credit 23,000 44,370
Payments under line of credit (22,000) (73,527)
Payments for financing costs (75) (168)
Proceeds from long-term debt 34,429 90,400
Payments of long-term debt and notes payable (18,803) (11,770)
Payments of capital lease obligations (21,694) (54,003)
Proceeds from non-controlling interests 98  
Net cash used in financing activities (3,556) (3,595)
Increase (decrease) in cash and cash equivalents (6,945) 1,929
Cash and cash equivalents at beginning of period 9,862 3,818
Cash and cash equivalents at end of period 2,917 5,747
Interest paid in cash during the period 10,695 9,509
Income taxes paid in cash during the period $ 268 $ 2,239