Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
OPERATING ACTIVITIES
Net income	$ 72,967	$ 72,677	$ 75,173
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	100,932	101,329	103,905
Deferred income taxes	4,699	2,755	(27,121)
Stock-based Compensation	2,065	539	511
Gain on disposal of property and equipment	(31,341)	(24,963)	(26,674)
Changes in certain working capital items:
Trade receivables	6,676	15,338	15,239
Prepaid expenses and other current assets	509	1,227	860
Accounts payable, accrued liabilities, and accrued expenses	(10,758)	(26,012)	(26,893)
Accrued income taxes	623	3,653	(5,462)
Net cash provided by operating activities	146,372	146,543	109,538
INVESTING ACTIVITIES
Proceeds from sale of property and equipment	92,942	130,752	147,578
Purchases of property and equipment, net of trades	(163,780)	(169,276)	(184,114)
Acquisition of business, net of cash acquired	(61,927)	0	(86,728)
Change in other assets	(26)	710	(233)
Net cash (used in) provided by investing activities	(132,791)	(37,814)	(123,497)
FINANCING ACTIVITIES
Cash dividends paid	(6,563)	(6,589)	(6,667)
Shares withheld for employee taxes related to stock-based compensation	(532)	(213)	(198)
Repayments on acquired debt	(93,348)	0	(23,303)
Repurchases of common stock	0	(25,087)	0
Net cash used in financing activities	(100,443)	(31,889)	(30,168)
Net increase (decrease) in cash, cash equivalents and restricted cash	(86,862)	76,840	(44,127)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Beginning of period	182,938	106,098	150,225
End of Period	96,076	182,938	106,098
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest Paid	929	0	153
Cash paid during the period for income taxes, net of refunds	18,888	12,832	21,909
Noncash investing and financing activities:
Purchased property and equipment in accounts payable	1,476	1,944	3,387
Sold revenue equipment in other current assets	1,282	3,783	869
RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Cash and Cash Equivalents	76,684	161,448	75,378
Restricted Cash included in other current assets	1,594	3,105	7,936
Restricted Cash included in other assets	17,798	18,385	22,784
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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
-SubTopic 10
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- References

No definition available.

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The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.

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-Publisher FASB
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
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The noncurrent cash, cash equivalents and investments that is restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits classified as long-term; that is not expected to be released from such existing restrictions within one year of the balance sheet date or operating cycle, whichever is longer. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes noncurrent cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.

+ References

No definition available.

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No definition available.

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