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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 11,277 $ 5,566
Trade accounts receivable, net 744,026 654,542
Prepaid expenses and other 71,705 197,817
Total current assets 827,008 857,925
Property and equipment, at cost 4,128,542 4,019,451
Less accumulated depreciation 1,361,627 1,318,122
Net property and equipment 2,766,915 2,701,329
Other assets 103,441 70,290
Total assets 3,697,364 3,629,544
Current liabilities:    
Trade accounts payable 343,652 340,332
Claims accruals 115,628 104,220
Accrued payroll 66,237 59,420
Other accrued expenses 27,199 28,445
Total current liabilities 552,716 532,417
Long-term debt 957,574 998,003
Other long-term liabilities 65,075 58,552
Deferred income taxes 742,574 740,220
Stockholders' equity 1,379,425 1,300,352
Total liabilities and stockholders' equity $ 3,697,364 $ 3,629,544