Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 6,485	$ 5,727
Marketable securities	9,139	9,333
Accounts receivable – net of allowance for doubtful accounts of $1,988 and $1,772, respectively	212,010	215,991
Other receivables	16,814	19,130
Prepaid expenses and other	18,991	19,830
Due from affiliates	3,353	5,247
Total current assets	266,792	275,258
Property and equipment – net of accumulated depreciation of $258,769 and $231,319, respectively	317,623	303,234
Operating lease right-of-use asset	79,628
Goodwill	158,416	145,152
Intangible assets – net of accumulated amortization of $75,055 and $62,624, respectively	106,989	113,775
Deferred income taxes	2,361	2,549
Other assets	2,920	3,179
Total assets	934,729	843,147
Current liabilities:
Accounts payable	101,483	92,019
Current portion of long-term debt	59,894	51,903
Insurance and claims	55,931	31,679
Accrued expenses and other current liabilities	27,242	25,126
Current portion of operating lease liabilities	24,860
Due to affiliates	20,371	17,764
Income taxes payable	2,470	2,678
Total current liabilities	292,251	221,169
Long-term liabilities:
Long-term debt, net of current portion	326,662	348,549
Operating lease liabilities, net of current portion	56,440
Deferred income taxes	56,243	59,228
Other long-term liabilities	5,218	4,902
Total long-term liabilities	444,563	412,679
Shareholders' equity:
Common stock, no par value. Authorized 100,000,000 shares; 30,970,452 and 30,965,452 shares issued; 27,282,230 and 28,378,827 shares outstanding, respectively	30,972	30,967
Paid-in capital	4,298	4,230
Treasury stock, at cost; 3,688,222 and 2,586,625 shares, respectively	(77,248)	(52,462)
Retained earnings	245,332	231,525
Accumulated other comprehensive income (loss):
Interest rate swaps, net of income taxes of $(60) and $94, respectively	(187)	298
Foreign currency translation adjustments	(5,252)	(5,259)
Total shareholders’ equity	197,915	209,299
Total liabilities and shareholders’ equity	$ 934,729	$ 843,147