Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash $ 18,415 $ 15,861
Accounts receivable, net 111,598 105,256
Operating supplies 6,968 5,661
Prepaid expenses 14,088 11,393
Other current assets 16,127 13,845
Total current assets 167,196 152,016
Property and equipment:    
Land and land improvements 16,553 13,904
Buildings and leasehold improvements 33,644 27,364
Equipment 482,752 442,882
Property and equipment 532,949 484,150
Less accumulated depreciation 372,066 347,266
Property and equipment, net 160,883 136,884
Other assets 18,862 16,917
Identified intangible assets and goodwill, net 34,063 27,561
Total assets 381,004 333,378
Current liabilities:    
Short-term debt 8,281 8,434
Accounts payable 42,140 37,922
Accrued expenses 34,925 36,858
Self-insurance accruals 23,007 22,057
Total current liabilities 108,353 105,271
Long-term debt 51,306 20,034
Senior unsecured notes 30,000 30,000
Self-insurance accruals 35,886 34,655
Other liabilities 18,968 12,280
Total liabilities 244,513 202,240
Common shareholders' equity:    
Common shares, $1.00 par value, per share; 24,000 shares authorized; 21,457 shares issued and outstanding before treasury shares as of December 31, 2014 and 2013 21,457 21,457
Additional paid-in capital 9,461 5,008
Common shares subscribed 9,381 10,467
Retained earnings 251,470 230,975
Accumulated other comprehensive loss (11,523) (4,393)
Stockholders' equity before treasury stock 280,246 263,514
Less: Cost of Common shares held in treasury; 8,292 shares in 2014 and 8,018 in 2013 138,155 125,034
Common shares subscription receivable 5,600 7,342
Common shareholders' equity 136,491 131,138
Total liabilities and shareholders' equity $ 381,004 $ 333,378