Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 03, 2015	Dec. 31, 2014
Current assets:
Cash	$ 15,916	$ 18,415
Accounts receivable, net	135,568	111,598
Operating supplies	6,822	6,968
Other current assets	28,728	30,215
Total current assets	187,034	167,196
Property and equipment	562,851	532,949
Less accumulated depreciation	392,151	372,066
Property and equipment, net	170,700	160,883
Other assets	20,088	18,862
Identified intangible assets and goodwill, net	35,294	34,063
Total assets	413,116	381,004
Current liabilities:
Accounts payable	33,106	42,140
Accrued expenses	34,999	34,925
Other current liabilities	43,248	31,288
Total current liabilities	111,353	108,353
Long-term debt	96,975	81,306
Self-insurance accruals	40,393	35,886
Other noncurrent liabilities	18,972	18,968
Total liabilities	267,693	244,513
Common shareholders' equity:
Common shares, $1.00 par value, per share; 48,000 shares authorized; 21,457 shares issued and outstanding before treasury shares as of October 3, 2015 and December 31, 2014	21,457	21,457
Additional paid-in capital	15,461	9,461
Common shares subscribed, unissued	8,820	9,381
Retained earnings	270,032	251,470
Accumulated other comprehensive loss	(14,680)	(11,523)
Shareholders' equity before treasury stock	301,090	280,246
Less: Cost of Common shares held in treasury; 8,526 shares at October 3, 2015 and 8,292 shares at December 31, 2014	151,257	138,155
Common shares subscription receivable	4,410	5,600
Common shareholders' equity	145,423	136,491
Total liabilities and shareholders' equity	$ 413,116	$ 381,004