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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net income $ 57,097 $ 48,890
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 5,632 5,678
Bad debt provision 3,200 2,225
Deferred income tax expense 2,748 20,767
Stock-based compensation expense 3,113 2,567
Tax benefit from equity compensation plans, gross (1,750) (1,062)
Amortization of premium on marketable securities 1,053 314
Unrealized gain on deferred compensation fund investments (1,041) 939
Changes in operating assets and liabilities:    
Accounts and notes receivable (54,954) (11,170)
Inventories and supplies (1,295) (425)
Prepaid expenses and other assets (5,279) (2,020)
Deferred compensation funding (941) 836
Accounts payable and other accrued expenses (6,774) (7,703)
Accrued payroll, accrued and withheld payroll taxes 22,065 (18,189)
Accrued insurance claims 4,870 11,384
Deferred compensation liability 2,284 (1,415)
Income taxes payable 7,870 889
Net cash provided by operating activities 37,898 52,505
Cash flows from investing activities:    
Disposals of fixed assets 177 248
Additions to property and equipment (3,908) (3,975)
Purchases of marketable securities (18,751) (52,219)
Sales of marketable securities 8,137 4,786
Net cash used in investing activities (14,345) (51,160)
Cash flows from financing activities:    
Dividends paid (39,849) (38,338)
Reissuance of treasury stock pursuant to Dividend Reinvestment Plan 84 83
Tax benefit from equity compensation plans, gross 1,750 1,062
Proceeds from the exercise of stock options 5,600 4,937
Net cash used in financing activities (32,415) (32,256)
Net change in cash and cash equivalents (8,862) (30,911)
Cash and cash equivalents at beginning of the period 33,189 75,280
Cash and cash equivalents at end of the period 24,327 44,369
Supplementary cash flow information:    
Cash paid for interest 441 137
Cash paid for income taxes, net of refunds $ 22,141 $ 7,508