Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 125,225	$ 85,046
Short-term marketable securities	35,437	46,750
Accounts receivable, net of allowance for doubtful accounts of $952 and $919 as of December 31, 2019 and December 31, 2018, respectively	57,450	59,155
Inventory	10,075	10,087
Prepaid expenses and other current assets	8,232	8,567
Income taxes receivable	0	5,757
Total current assets	236,419	215,362
Property and equipment, net	263,712	228,001
Goodwill	128,752	128,752
Other intangible assets, net	17,369	19,850
Long-term marketable securities	12,960	23,579
Operating lease assets	11,425	0
Other long-term assets	3,030	3,441
Total assets	673,667	618,985
Current liabilities
Accounts payable	16,804	17,411
Accrued compensation	15,058	18,130
Accrued liabilities and other	11,057	16,702
Current operating lease liabilities	3,340	0
Income taxes payable	1,322	491
Total current liabilities	47,581	52,734
Long-term operating lease liabilities	8,565	0
Long-term deferred tax liabilities	26,283	20,162
Other long-term liabilities	5,448	4,592
Total liabilities	87,877	77,488
Shareholders' equity
Preferred stock, $0.001 par value, authorized 10,000,000 shares; issued and outstanding 0 shares as of December 31, 2019 and December 31, 2018, respectively	0	0
Common stock, $0.001 par value, authorized 150,000,000 shares; issued and outstanding 26,786,459 and 26,984,747 shares as of December 31, 2019 and December 31, 2018, respectively	27	27
Additional paid-in capital	268,059	258,502
Retained earnings	324,722	291,460
Accumulated other comprehensive loss	(7,018)	(8,492)
Total shareholders' equity	585,790	541,497
Total liabilities and shareholders' equity	$ 673,667	$ 618,985