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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
CURRENT ASSETS |  |
Cash and cash equivalents | $ 120,772 | $ 114,280
Short-term investments | 56,401 | 56,838
Restricted cash |  | 962
Accounts receivable, less allowances (2017 – $7,657; 2016 – $5,437) | 279,074 | 260,643
Other accounts receivable, less allowances (2017 – $921; 2016 – $849) | 19,491 | 22,041
Prepaid expenses | 22,183 | 22,124
Prepaid and refundable income taxes | 12,296 | 9,909
Other | 12,132 | 4,300
TOTAL CURRENT ASSETS | 522,349 | 491,097
PROPERTY, PLANT AND EQUIPMENT |  |
Land and structures | 344,224 | 324,086
Revenue equipment | 793,523 | 743,860
Service, office, and other equipment | 179,950 | 154,119
Software | 129,589 | 120,877
Leasehold improvements | 8,888 | 8,758
TOTAL PROPERTY, PLANT AND EQUIPMENT, GROSS | 1,456,174 | 1,351,700
Less allowances for depreciation and amortization | 865,010 | 819,174
PROPERTY, PLANT AND EQUIPMENT, net | 591,164 | 532,526
GOODWILL | 108,320 | 108,875
INTANGIBLE ASSETS, net | 73,469 | 80,507
DEFERRED INCOME TAXES | 5,965 | 2,978
OTHER LONG-TERM ASSETS | 64,374 | 66,095
TOTAL ASSETS | 1,365,641 | 1,282,078
CURRENT LIABILITIES |  |
Accounts payable | 129,099 | 133,301
Income taxes payable | 324 |
Accrued expenses | 211,237 | 198,731
Current portion of long-term debt | 61,930 | 64,143
TOTAL CURRENT LIABILITIES | 402,590 | 396,175
LONG-TERM DEBT, less current portion | 206,989 | 179,530
PENSION AND POSTRETIREMENT LIABILITIES | 39,827 | 35,848
OTHER LONG-TERM LIABILITIES | 15,616 | 16,790
DEFERRED INCOME TAXES | 49,157 | 54,680
STOCKHOLDERS' EQUITY |  |
Common stock, $0.01 par value, authorized 70,000,000 shares; issued 2017: 28,495,628 shares; 2016: 28,174,424 shares | 285 | 282
Additional paid-in capital | 319,436 | 315,318
Retained earnings | 438,379 | 386,917
Treasury stock, at cost, 2017: 2,851,578 shares; 2016: 2,565,399 shares | (86,064) | (80,045)
Accumulated other comprehensive loss | (20,574) | (23,417)
TOTAL STOCKHOLDERS' EQUITY | 651,462 | 599,055
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | $ 1,365,641 | $ 1,282,078

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- Definition Amount of asset related to consideration paid in advance for costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6787-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section 05 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68074540&loc=d3e5879-108316 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 + Details
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