Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Cash Flows [Abstract]
Net loss	$ (30,384)	$ (26,496)	$ (15,278)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	26,749	25,627	20,864
Amortization of intangible assets	23,949	23,791	23,644
Stock-based compensation expense	11,560	10,384	8,286
Amortization of deferred costs	909	1,316	1,517
Provision for bad debt and customer credits	2,837	1,802	1,594
Deferred income tax benefit	(957)	(4,708)	(8,338)
Other, net	(5)	572	(18)
Changes in operating assets and liabilities:
Accounts receivable	(5,950)	(11,390)	(2,363)
Prepaid expenses and other assets	(3,733)	146	(1,181)
Accounts payable	(846)	884	5,142
Accrued expenses and other liabilities	2,895	(499)	4,132
Deferred revenue	3,678	4,344	4,008
Net cash provided by operating activities	30,702	25,773	42,009
Cash flows from investing activities:
Capitalized software development costs	(25,440)	(27,076)	(20,495)
Capital expenditures	(12,703)	(9,823)	(6,976)
Purchases of investments	0	(27,062)	(47,604)
Maturities of investments	11,750	36,879	43,326
Purchases of cost method investments	(1,000)	(3,499)	0
Acquisitions, net of cash acquired	0	(8,843)	(600)
Restricted cash	0	2,443	(2,443)
Net cash used in investing activities	(27,393)	(36,981)	(34,792)
Cash flows from financing activities:
Proceeds from issuance of long-term debt	4,719	79,200	0
Payments on long-term debt	(800)	(75,498)	(821)
Payments of outstanding financing arrangements	(228)	(376)	(708)
Debt issuance costs	0	(2,849)	(284)
Exercise of stock options and issuance of common stock, net of withholding taxes	2,953	1,662	1,645
Other	(1,531)	(188)	0
Net cash provided by (used in) financing activities	5,113	1,951	(168)
Effect of foreign exchange rate changes on cash and cash equivalents	(1,229)	(601)	(307)
Net increase (decrease) in cash and cash equivalents	7,193	(9,858)	6,742
Cash and cash equivalents at beginning of period	40,682	50,540	43,798
Cash and cash equivalents at end of period	47,875	40,682	50,540
Cash paid during the period for:
Interest (net of capitalized interest of $1.7 million, $1.8 million and $0.5, respectively)	4,245	4,033	4,136
Income tax	$ 1,629	$ 2,572	$ 2,416