Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of loss before income taxes [Abstract]
United States													$ (39,888)	$ (32,231)	$ (7,976)
Foreign													3,794	7,502	6,110
Loss before income taxes	(629)	(4,579)	(27,408)	(3,478)	(16,571)	(2,142)	(3,758)	(2,258)	(208)	(1,255)	341	(744)	(36,094)	(24,729)	(1,866)
Current [Abstract]
Federal													0	0	(4,191)
State													588	482	(287)
Foreign													0	28	35
Total current													588	510	(4,443)
Deferred [Abstract]
Federal													1,054	925	5,636
State													(89)	279	425
Foreign													1,336	2,377	2,047
Total deferred													2,301	3,581	8,108
Total provision													2,889	4,091	3,665
Statutory income tax rate (in hundredths)													35.00%	35.00%	35.00%
Reconciliation of actual income taxes and expected income taxes [Abstract]
Expected tax benefit													(12,633)	(8,655)	(653)
Total increase (decrease) in income taxes resulting from [Abstract]
Change in valuation allowance allocated to income tax expense													16,223	13,987	10,641
Acquisition costs													(293)	309	(684)
State and local income taxes, net of federal income tax benefit													(8)	(672)	(212)
Foreign income tax rate differential													(426)	(723)	(463)
Change in unrecognized tax benefits													359	167	(4,669)
Other													(333)	(322)	(295)
Actual income tax expense (benefit)													2,889	4,091	3,665
Deferred Tax Assets [Abstract]
Accrued compensation	1,354				162								1,354	162
Bad debt	2,977				3,844								2,977	3,844
Depreciation	1,780				2,703								1,780	2,703
Research and experimentation credit carryforwards	6,951				6,951								6,951	6,951
Other credit carryforwards	1,566				1,566								1,566	1,566
Domestic loss carryforwards	125,143				115,421								125,143	115,421
Foreign loss carryforwards	7,240				8,007								7,240	8,007
Nonqualified stock options	6,667				5,374								6,667	5,374
Other	4,249				5,576								4,249	5,576
Total gross deferred tax assets	157,927				149,604								157,927	149,604
Less: asset valuation allowance	(136,364)				(121,117)								(136,364)	(121,117)
Net deferred tax asset	21,563				28,487								21,563	28,487
Deferred tax liabilities:
Software development costs and intangible assets	(5,656)				(7,572)								(5,656)	(7,572)
Intangibles-customer contracts & tradenames	(5,977)				(8,680)								(5,977)	(8,680)
Other	(5,101)				(5,105)								(5,101)	(5,105)
Total gross deferred liabilities	(16,734)				(21,357)								(16,734)	(21,357)
Net deferred tax asset	4,829				7,130								4,829	7,130
Included on balance sheet [Abstract]
Current assets: deferred income taxes	1,915				3,135								1,915	3,135
Non-current asset: deferred income taxes	6,979				7,041								6,979	7,041
Non-current liabilities: deferred income taxes	(4,065)				(3,046)								(4,065)	(3,046)
Net deferred tax asset	4,829				7,130								4,829	7,130
Estimated unrealizable deferred tax assets	30,570												30,570
Net increase in the valuation allowance													15,247	15,375	4,358
Potential tax benefits associated with stock based compensation	1,892				1,638								1,892	1,638
Unrecognized tax benefits, interest on income tax penalties accrued	299				162								299	162
Unrecognized tax benefits, income tax penalties accrued	199				102								199	102
Total interest included in tax expense													138	19	(111)
Total penalties included in tax expense													98	48	(3)
Reconciliation of the total amounts of unrecognized tax benefits [Abstract]
Balance at January 1				2,109				1,862				6,703	2,109	1,862	6,703
Gross increases - tax positions in current year													0	55	0
Gross increases - tax positions in prior year													123	192	0
Gross decreases - tax positions in prior year													0	0	(12)
Decreases due to statute expirations													0	0	(4,829)
Balance at December 31	2,232				2,109				1,862				2,232	2,109	1,862
Unrecognized tax benefits affect the effective tax rate	2,029				1,948								2,029	1,948
Period for which no expected change in unrecognized tax benefit													12 months
Federal [Member]
Included on balance sheet [Abstract]
Net operating loss carryforwards	324,683												324,683
Federal [Member] | Research Credit [Member]
Included on balance sheet [Abstract]
Tax credit carryforward, amount	4,911												4,911
Federal [Member] | Alternative Minimum Tax Credit [Member]
Included on balance sheet [Abstract]
Tax credit carryforward, amount	977												977
State [Member]
Included on balance sheet [Abstract]
Net operating loss carryforwards	173,169												173,169
State [Member] | Research Credit [Member]
Included on balance sheet [Abstract]
Tax credit carryforward, amount	408												408
Foreign [Member]
Included on balance sheet [Abstract]
Net operating loss carryforwards	24,358												24,358
Capital loss	5,631												5,631
Tax credit carryforward, amount	297												297
Foreign [Member] | Research Credit [Member]
Included on balance sheet [Abstract]
Tax credit carryforward, amount	2,008												2,008
Provincial [Member]
Included on balance sheet [Abstract]
Net operating loss carryforwards	16,291												16,291
Capital loss	5,631												5,631
Provincial [Member] | Research Credit [Member]
Included on balance sheet [Abstract]
Tax credit carryforward, amount	$ 291												$ 291