Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 31, 2018
Current assets:
Cash	$ 26,664	$ 22,661
Accounts receivable, net	194,225	195,906
Operating supplies	12,739	14,415
Other current assets	19,462	22,086
Total current assets	253,090	255,068
Property and equipment	654,408	639,396
Less accumulated depreciation	445,649	437,111
Total property and equipment, net	208,759	202,285
Right-of-use assets - operating leases	36,307	0
Other assets	17,293	21,769
Intangible assets and goodwill, net	50,029	47,501
Total assets	565,478	526,623
Current liabilities:
Accounts payable	36,729	43,958
Accrued expenses	35,061	44,061
Current portion of long-term debt and finance lease liabilities	18,549	23,859
Other current liabilities	43,732	27,434
Total current liabilities	134,071	139,312
Long-term debt	176,508	155,563
Lease liabilities - finance leases	2,079	2,862
Lease liabilities - operating leases	24,034	0
Self-insurance reserve	55,158	56,351
Other noncurrent liabilities	10,924	10,125
Total liabilities	402,774	364,213
Redeemable common shares related to 401KSOP and Employee Stock Ownership Plan (ESOP); 5,837 and 5,642 shares at redemption value as of March 30, 2019 and December 31, 2018	123,151	119,049
Common shareholders' equity:
Common shares, $1.00 par value, per share; 48,000 shares authorized; 37,077 and 37,272 shares issued and outstanding before deducting treasury shares and which excludes 5,837 and 5,642 shares subject to redemption as of March 30, 2019 and December 31, 2018	37,077	37,272
Additional paid-in capital	81,201	82,623
Common shares subscribed, unissued	6,408	6,799
Retained earnings	156,389	157,472
Accumulated other comprehensive loss	(4,481)	(5,034)
Shareholders' equity before treasury stock	276,594	279,132
Less: Cost of common shares held in treasury; 19,987 shares at March 30, 2019 and 20,033 shares at December 31, 2018	236,470	235,042
Common shares subscription receivable	571	729
Total common shareholders' equity	39,553	43,361
Total liabilities and shareholders' equity	$ 565,478	$ 526,623