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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
OPERATING ACTIVITIES:      
Net income $ 11,101 $ 21,436 $ 13,491
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 39,114 32,346 36,296
Bad debt expense 445 151 456
Stock compensation—net of excess tax benefits 302 267 270
Sale leaseback deferred gain amortization (131) (224) (205)
Deferred 6,658 12,901 7,512
Reclassification of other than temporary impairment in marketable equity securities 709 833 1
Recognized gain on marketable equity securities (1,003) (1,001) (1,040)
Gain on sale or disposal of equipment (4,700) (5,754) (4,591)
Changes in operating assets and liabilities:      
Accounts receivable (6,725) 1,128 5,109
Prepaid expenses, deposits, inventories, and other assets (685) 1,470 (3,299)
Income taxes refundable 2,127 (2,358) (277)
Trade accounts payable 3,231 886 (1,555)
Accrued expenses and other liabilities (3,041) (556) 3,085
Net cash provided by operating activities 47,402 61,525 55,253
INVESTING ACTIVITIES:      
Purchases of property and equipment (86,128) (125,720) (28,588)
Proceeds from disposition of equipment 32,256 33,472 38,902
Changes in restricted cash 317 8,012 (7,873)
Sales of marketable equity securities 1,550 1,500 1,720
Purchases of marketable equity securities, net of return of capital (810) (2,769) (4,210)
Net cash used in investing activities (52,815) (85,505) (49)
FINANCING ACTIVITIES:      
Borrowings under line of credit 520,089 549,955 469,918
Repayments under line of credit (528,200) (539,979) (469,918)
Borrowings of long-term debt 83,517 88,018 42,979
Repayments of long-term debt (47,457) (53,947) (58,247)
Borrowings under margin account 1,078 3,005 4,351
Repayments under margin account (2,669) (2,779) (2,645)
Repurchases of common stock (21,056) (48,021) (16,011)
Exercise of stock options 91 236 846
Net cash provided by (used in) financing activities 5,393 (3,512) (28,727)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (20) (27,492) 26,477
CASH AND CASH EQUIVALENTS—Beginning of year 157 27,649 1,172
CASH AND CASH EQUIVALENTS—End of year 137 157 27,649
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION—      
Interest 3,597 2,821 2,946
Income taxes 286 2,950 1,486
NONCASH INVESTING AND FINANCING ACTIVITIES—      
Purchases of revenue equipment included in accounts payable 97 5,031 1,079
Purchases of common stock included in accrued expenses and other liabilities $ 28,743