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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income $ 62,069 $ 93,152 $ 46,574
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization expense 79,655 82,524 72,877
Deferred income tax expense 26,848 15,258 13,107
Stock-based compensation 3,560 2,044 2,889
Tax benefit from exercise of stock options (3,015) (3,447) (1,324)
Loss on disposition of assets 519 1,329 644
Unrealized loss on derivative instrument 143 257 800
Loss from equity method investee 212    
Changes in operating assets and liabilities, net of effects of acquisitions:      
Increase in receivables (8,783) (46,692) (23,725)
Increase in inventories and work-in-process on medical interiors and products contracts (5,860) (6,614) (2,578)
Decrease (increase) in prepaid expenses and other current assets (7,824) 12,803 (12,093)
Decrease (increase) in costs in excess of billings (2,303) 1,269 (1,694)
Increase (decrease) in accounts payable, other accrued liabilities, and other liabilities 4,483 1,809 (1,193)
Increase (decrease) in deferred revenue and billings in excess of costs (54) (2,397) 487
Net cash provided by operating activities 149,650 151,295 94,771
Cash flows from investing activities:      
Acquisition of subsidiaries (note 2) (65,641) (47,912) (202,734)
Buy-out of previously leased aircraft (57,458) (65,661) (35,237)
Acquisition of property and equipment (65,804) (27,024) (21,541)
Proceeds from disposition and sale of equipment and assets held for sale 20,471 33,423 8,754
Increase in other assets, net (6,660) (2,825) (170)
Net cash used in investing activities (175,092) (109,999) (250,928)
Cash flows from financing activities:      
Proceeds from issuance of common stock 1,749 4,694 3,686
Payment of cash dividend   (91,629)  
Tax benefit from exercise of stock options 3,015 3,447 1,324
Borrowings under line of credit 69,370 135,738 31,271
Payments under line of credit (124,370) (80,008) (20,000)
Proceeds from long-term debt 194,628 111,888 204,750
Payments for financing costs (868) (888) (1,807)
Payments of long-term debt (27,653) (25,707) (49,161)
Payments of capital lease obligations (84,727) (98,575) (71,054)
Proceeds from non-controlling interests 342    
Net cash provided (used) by financing activities 31,486 (41,040) 99,009
Increase (decrease) in cash and cash equivalents 6,044 256 (57,148)
Cash and cash equivalents at beginning of year 3,818 3,562 60,710
Cash and cash equivalents at end of year 9,862 3,818 3,562
Interest paid in cash during the year 19,563 20,083 19,407
Income taxes paid in cash during the year $ 17,404 $ 43,041 $ 15,351