Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 75,819	$ 82,822
Restricted cash	3,000	11,987
Accounts receivable, net of allowance for doubtful accounts of $898 at June 30, 2018 and $634 at December 31, 2017	36,491	34,461
Income tax refunds receivable	1,844	1,204
Prepaid expenses and other current assets	7,491	5,714
Total current assets	124,645	136,188
Property and equipment, net	15,543	16,763
Goodwill	277,121	279,131
Intangible assets, net	78,335	84,856
Restricted cash	6,000	6,000
Other assets	6,313	3,112
Total assets	507,957	526,050
Current liabilities:
Accounts payable	1,337	1,467
Accrued expenses and other current liabilities	31,127	43,096
Accrued income taxes payable	183	522
Deferred revenue	13,771	15,102
Total current liabilities	46,418	60,187
Revolving line of credit	85,000	93,000
Other long-term liabilities	6,925	6,428
Deferred income taxes	26,351	28,004
Reserve for income taxes	2,839	2,783
Accrued pension benefits	6,194	6,280
Commitments and contingencies (Note 14)
Stockholders' equity:
Preferred stock, $0.001 par value, Authorized shares: 10,000,000; Issued and outstanding: none
Common stock, $0.001 par value, Authorized shares: 250,000,000; Shares issued: 45,738,145 at June 30, 2018 and 44,934,364 at December 31, 2017	44	44
Additional paid-in capital	308,952	298,113
Treasury stock, at cost, 3,586,782 shares at June 30, 2018 and 3,215,644 shares at December 31, 2017	(66,581)	(64,083)
Retained earnings	96,477	97,815
Accumulated other comprehensive loss	(4,662)	(2,521)
Total stockholders' equity	334,230	329,368
Total liabilities and stockholders' equity	$ 507,957	$ 526,050