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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
OPERATING ACTIVITIES:      
Net income $ 21,436 $ 13,491 $ 5,915
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation 32,346 36,296 39,088
Bad debt expense 151 456 424
Stock compensation—net of excess tax benefits 267 270 $ 317
Sale leaseback deferred gain amortization (224) (205)
Deferred income taxes 12,901 7,512 $ 3,597
Reclassification of other than temporary impairment in marketable equity securities 833 1 29
Recognized gain on marketable equity securities (1,001) (1,040) (601)
Gain on sale or disposal of equipment (5,754) (4,591) (854)
Changes in operating assets and liabilities:      
Accounts receivable 1,128 5,109 (8,873)
Prepaid expenses, deposits, inventories, and other assets 1,470 (3,299) 4,918
Income taxes refundable (2,358) (277) 124
Trade accounts payable 886 (1,555) (2,802)
Accrued expenses and other liabilities (556) 3,085 1,888
Net cash provided by operating activities 61,525 55,253 43,170
INVESTING ACTIVITIES:      
Purchases of property and equipment (125,720) (28,588) (71,520)
Proceeds from disposition of equipment 33,472 38,902 27,304
Changes in restricted cash 8,012 (7,873) (120)
Sales of marketable equity securities 1,500 1,720 857
Purchases of marketable equity securities, net of return of capital (2,769) (4,210) (838)
Net cash used in investing activities (85,505) (49) (44,317)
FINANCING ACTIVITIES:      
Borrowings under line of credit 549,955 469,918 422,324
Repayments under line of credit (539,979) (469,918) (427,741)
Borrowings of long-term debt 88,018 42,979 41,593
Repayments of long-term debt (53,947) (58,247) (33,208)
Borrowings under margin account 3,005 4,351 999
Repayments under margin account (2,779) (2,645) (1,693)
Repurchases of common stock (48,021) (16,011) (508)
Exercise of stock options 236 846 46
Net cash (used in) provided by financing activities (3,512) (28,727) 1,812
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS (27,492) 26,477 665
CASH AND CASH EQUIVALENTS—Beginning of year 27,649 1,172 507
CASH AND CASH EQUIVALENTS—End of year 157 27,649 1,172
Cash paid during the period for:      
Interest 2,821 2,946 3,417
Income taxes 2,950 1,486 77
NONCASH INVESTING AND FINANCING ACTIVITIES—      
Purchases of revenue equipment included in accounts payable $ 5,031 1,079 598
Purchases of common stock included in accrued expenses and other liabilities $ 28,743 $ 13,944