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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Consolidated net income $ 10,123 $ 15,892
Loss from discontinued operations, net of income taxes 0 (10,126)
Adjustments to reconcile consolidated net income to net cash provided by operating activities:    
Depreciation and amortization 4,307 5,146
Non-cash operating lease cost 1,319 1,320
Stock-based compensation to employees and directors 4,639 2,305
Decrease in deferred income taxes, net 959 1
Loss from equity method securities 299 0
Other non-cash adjustments (123) 637
Changes in operating assets and liabilities:    
Accounts receivable, net (2,559) (15,651)
Inventories (282) (468)
Prepaids and other current assets 1,604 447
Other long-term assets, net (307) (448)
Accounts payable 4,339 25,589
Accrued liabilities 7,886 6,693
Unearned revenue 2,034 24,143
Operating lease liabilities (1,329) (1,379)
Other long-term liabilities 284 (269)
Net cash provided by continuing operating activities 33,193 74,084
Net cash used in discontinued operating activities 0 (12,353)
Net cash provided by operating activities 33,193 61,731
Cash flows from investing activities:    
Purchase of equity securities (11,420) 0
Capital distribution from investment 1,162 0
Expenditures for property and equipment (3,256) (2,395)
Other investing activities, net (281) (367)
Net cash used in continuing investing activities (13,795) (2,762)
Net cash provided by discontinued investing activities 0 5,737
Net cash provided by (used in) investing activities (13,795) 2,975
Cash flows from financing activities:    
Repurchase of shares (25,165) 0
Payments on long-term debt (854) (551)
Payments of taxes withheld upon vesting of employee stock awards (3,267) (7,292)
Other financing activities, net 0 (1)
Net cash used in continuing financing activities (29,286) (7,844)
Net cash provided by discontinued financing activities 0 2,085
Net cash used in financing activities (29,286) (5,759)
Net increase (decrease) in cash, cash equivalents, and restricted cash (9,888) 58,947
Cash, cash equivalents, and restricted cash, beginning of period, inclusive of cash balances of discontinued operations 503,366 519,181
Cash, cash equivalents, and restricted cash, end of period, inclusive of cash balances of discontinued operations 493,478 578,128
Less: Cash, cash equivalents, and restricted cash of discontinued operations 0 42,120
Cash, cash equivalents, and restricted cash, end of period $ 493,478 $ 536,008