Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
OPERATING ACTIVITIES
Net Income	$ 24,466	$ 20,714	$ 58,942	$ 53,134
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization			78,286	81,786
Deferred income taxes			(8,623)	9,256
Stock-based compensation			959	1,509
Gain on disposal of property and equipment	(15,254)	(5,721)	(27,341)	(8,739)
Changes in certain working capital items:
Trade receivables			(2,961)	(5,785)
Prepaid expenses and other current assets			3,041	(6,645)
Accounts payable, accrued liabilities, and accrued expenses			(9,231)	5,101
Accrued income taxes			2,622	3,370
Net cash provided by operating activities			95,694	132,987
INVESTING ACTIVITIES
Proceeds from sale of property and equipment			98,421	51,473
Purchases of property and equipment			(93,213)	(163,824)
Change in other assets			(181)	72
Net cash provided by (used in) investing activities			5,027	(112,279)
FINANCING ACTIVITIES
Payments of cash dividends			(3,198)	(4,884)
Shares withheld for employee taxes related to stock-based compensation			(190)	(431)
Repurchases of common stock			(31,422)	(12,278)
Net cash used in financing activities			(34,810)	(17,593)
Net increase in cash, cash equivalents and restricted cash			65,911	3,115
CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Beginning of period			131,140	96,076
Ending Period	197,051	99,191	197,051	99,191
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid during the period for income taxes, net of refunds			26,455	4,598
Noncash investing and financing activities:
Purchased property and equipment in accounts payable			3,258	12,114
Sold revenue equipment and property in other current assets			1,423	5,195
Common stock dividends declared in accounts payable			41,095	0
RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Cash and Cash Equivalents, at Carrying Value	180,366	81,949	180,366	81,949
Restricted Cash and Investments, Current	932	1,097	932	1,097
Restricted Cash and Cash Equivalents, Noncurrent	15,753	16,145	15,753	16,145
Ending Period	$ 197,051	$ 99,191	$ 197,051	$ 99,191

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 210
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 954
-SubTopic 210
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120413209&loc=SL6242269-115581

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_RestrictedCashAndInvestmentsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration