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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
CURRENT ASSETS |  |
Cash and cash equivalents | $ 134,788 | $ 164,973
Short-term investments | 69,608 | 61,597
Restricted cash | 1,385 | 1,384
Accounts receivable, less allowances (2016 – $4,399; 2015 – $4,825) | 226,796 | 236,097
Other accounts receivable, less allowances (2016 – $1,085; 2015 – $1,029) | 6,854 | 6,718
Prepaid expenses | 24,725 | 20,801
Deferred income taxes | 36,510 | 38,443
Prepaid and refundable income taxes | 28,082 | 18,134
Other | 5,012 | 3,936
TOTAL CURRENT ASSETS | 533,760 | 552,083
PROPERTY, PLANT AND EQUIPMENT |  |
Land and structures | 280,510 | 273,839
Revenue equipment | 700,078 | 699,844
Service, office, and other equipment | 148,675 | 145,286
Software | 130,318 | 127,010
Leasehold improvements | 25,645 | 25,419
TOTAL PROPERTY, PLANT AND EQUIPMENT, GROSS | 1,285,226 | 1,271,398
Less allowances for depreciation and amortization | 802,620 | 788,351
PROPERTY, PLANT AND EQUIPMENT, net | 482,606 | 483,047
GOODWILL | 96,577 | 96,465
INTANGIBLE ASSETS, net | 76,300 | 76,787
OTHER ASSETS | 55,988 | 54,527
TOTAL ASSETS | 1,245,231 | 1,262,909
CURRENT LIABILITIES |  |
Accounts payable | 139,607 | 130,869
Income taxes payable |  | 91
Accrued expenses | 176,918 | 188,727
Current portion of long-term debt | 45,905 | 44,910
TOTAL CURRENT LIABILITIES | 362,430 | 364,597
LONG-TERM DEBT, less current portion | 157,485 | 167,599
PENSION AND POSTRETIREMENT LIABILITIES | 56,603 | 51,241
OTHER LIABILITIES | 12,206 | 12,689
DEFERRED INCOME TAXES | 79,256 | 78,055
STOCKHOLDERS' EQUITY |  |
Common stock, $0.01 par value, authorized 70,000,000 shares; issued 2016: 27,950,867 shares; 2015: 27,938,319 shares | 280 | 279
Additional paid-in capital | 311,199 | 309,653
Retained earnings | 368,636 | 376,827
Treasury stock, at cost, 2016: 2,214,146 shares; 2015: 2,080,187 shares | (73,137) | (70,535)
Accumulated other comprehensive loss | (29,727) | (27,496)
TOTAL STOCKHOLDERS' EQUITY | 577,251 | 588,728
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | $ 1,245,231 | $ 1,262,909

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- Definition Aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet. Noncurrent liabilities are expected to be paid after 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 S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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