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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income $ 72 $ 22,017
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,410 1,886
Bad debt provision 37,137 1,050
Stock-based compensation expense, net of tax benefit from equity compensation plans 421 445
Amortization of premium on marketable securities 339 343
Unrealized gain on deferred compensation fund investments (300) (1,209)
Changes in operating assets and liabilities:    
Accounts and notes receivable (16,769) (10,412)
Inventories and supplies 119 506
Prepaid expenses and other assets (3,483) (2,859)
Deferred compensation funding (259) 246
Accounts payable and other accrued expenses (5,478) 3,639
Accrued payroll, accrued and withheld payroll taxes 18,546 15,299
Income taxes payable (13,291) 1,852
Accrued insurance claims 3,443 784
Deferred compensation liability 1,024 1,059
Net cash provided by operating activities 23,931 34,646
Cash flows from investing activities:    
Disposals of fixed assets 63 104
Additions to property and equipment (1,335) (1,325)
Purchases of marketable securities (5,397) (7,858)
Sales of marketable securities 2,467 7,723
Net cash used in investing activities (4,202) (1,356)
Cash flows from financing activities:    
Dividends paid (14,149) (13,624)
Reissuance of treasury stock pursuant to Dividend Reinvestment Plan 24 24
Proceeds from the exercise of stock options 4,710 4,687
Net repayments of short-term borrowings (9,382) 0
Net cash used in financing activities (18,797) (8,913)
Net change in cash and cash equivalents 932 24,377
Cash and cash equivalents at beginning of the period 9,557 23,853
Cash and cash equivalents at end of the period $ 10,489 $ 48,230