Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jul. 04, 2015	Dec. 31, 2014
Current assets:
Cash	$ 18,226	$ 18,415
Accounts receivable, net	130,495	111,598
Operating supplies	7,098	6,968
Other current assets	21,562	30,215
Total current assets	177,381	167,196
Property and equipment	559,580	532,949
Less accumulated depreciation	383,956	372,066
Property and equipment, net	175,624	160,883
Other assets	20,308	18,862
Identified intangible assets and goodwill, net	34,882	34,063
Total assets	408,195	381,004
Current liabilities:
Accounts payable	33,377	42,140
Accrued expenses	28,693	34,925
Other current liabilities	25,430	31,288
Total current liabilities	87,500	108,353
Long-term debt	121,675	81,306
Self-insurance accruals	38,331	35,886
Other noncurrent liabilities	18,832	18,968
Total liabilities	266,338	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 July 4, 2015	21,457	21,457
Additional paid-in capital	14,611	9,461
Common shares subscribed, unissued	9,076	9,381
Retained earnings	262,525	251,470
Accumulated other comprehensive loss	(13,333)	(11,523)
Shareholders' equity before treasury stock	294,336	280,246
Less: Cost of Common shares held in treasury; 8,420 shares at July 4, 2015 and 8,292 shares at December 31, 2014	147,383	138,155
Common shares subscription receivable	5,096	5,600
Common shareholders' equity	141,857	136,491
Total liabilities and shareholders' equity	$ 408,195	$ 381,004