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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net income $ 28,855 $ 4,263
Adjustments to reconcile net income to net cash provided by operating activities:    
Provision for losses on accounts receivable 196 536
Deferred (reversal) gain on sales to equity method investee 38 (54)
Depreciation and amortization 43,741 36,410
Amortization of deferred financing fees 199 185
Deferred income tax benefit 1,798 $ 5,043
Casualty premium credit (3,600)
Income tax benefit arising from restricted share vesting (1,757) $ (145)
Unrealized gain (loss) on ineffective portion of cash flow hedges (1,290) $ 525
Return of cash collateral on fuel hedge 5,000
Stock-based compensation expense 1,136 $ 963
Equity in income of affiliate (3,720) (2,530)
Gain on disposition of property and equipment (373) (1,934)
Changes in operating assets and liabilities:    
Receivables and advances 22,655 208
Prepaid expenses and other assets 1,102 704
Inventory and supplies 250 214
Insurance and claims accrual (3,599) 6,212
Accounts payable and accrued expenses (12,071) (2,007)
Net cash flows provided by operating activities 78,560 48,593
Cash flows from investing activities:    
Acquisition of property and equipment $ (145,611) (93,416)
Return on investment in affiliated company 307
Proceeds from disposition of property and equipment $ 31,104 69,159
Net cash flows used in investing activities $ (114,507) (23,950)
Cash flows from financing activities:    
Change in checks outstanding in excess of bank balances (2,918)
Proceeds from issuance of notes payable $ 93,419 64,565
Proceeds from the exercise of stock options 1,092 152
Income tax benefit arising from restricted share vesting 1,757 145
Repayments of notes payable (59,337) (65,570)
Repayments of capital lease obligations $ (1,286) (5,840)
Proceeds under revolving credit facility, net (6,983)
Payment of minimum tax withholdings on stock compensation $ (1,786) $ (174)
Common stock repurchased (4,994)
Debt refinancing costs (226) $ (49)
Net cash provided by (used in) financing activities 28,639 (16,672)
Net change in cash and cash equivalents (7,308) 7,971
Cash and cash equivalents at beginning of period 21,330 9,263
Cash and cash equivalents at end of period $ 14,022 $ 17,234