ACQUISITIONS (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Apr. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Acquisitions
Post closing tax benefit				$ 23,000
Cash consideration in escrow deposit		$ 13,000		$ 13,000
Escrow deposit term				15 months
Basic net income (loss) per common share		$ (0.52)	$ 0.14	$ (0.57)	$ (0.02)
Diluted net income (loss) per common share		$ (0.52)	$ 0.14	$ (0.57)	$ (0.02)
Intangible assets:
Goodwill		$ 478,773		$ 478,773		$ 404,187
Capital lease obligations		9,061		9,061
Pro forma financial information
Revenue		142,535	$ 111,006	399,573	$ 359,333
Net income (loss)		(19,180)	5,010	(20,688)	(707)
Interest Expense		5,374	3,945	15,083	12,674
Iris Data Services Inc
Pro forma financial information
Revenue		11,000		18,700
Net income (loss)		2,800		4,200
Iris Data Services Inc
Acquisitions
Total purchase price	$ 133,700
Cash consideration	124,600
Cash consideration paid to seller	68,600
Cash consideration paid to plan participants	55,200
Cash consideration paid to plan participants and post-closing working capital adjustment		800
Portion of cash consideration payable to plan participants		600		600
Post-closing working capital settlement paid to the seller		200		200
Goodwill deductible for income tax purposes	5,300
Intangible assets:
Fair value of intangible assets acquired	34,694
Cash and cash equivalents	197
Accounts receivable	15,623
Income tax receivable	1,033
Other current assets	1,484
Deferred income tax assets	21,041
Property and equipment	10,642
Other long-term assets	246
Intangible assets	34,694
Goodwill	74,852
Total assets acquired	159,812
Accounts payable	4,407
Accrued liabilities	4,868
Deferred revenue	1,580
Deferred income tax liabilities	15,149
Capital lease obligations	9,061
Total liabilities assumed	35,065
Net assets acquired	124,747
Pro forma financial information
Revenue		142,535	119,524	416,795	387,054
Net income (loss)		(18,596)	$ 2,278	(19,940)	$ (8,153)
Acquisition related expense				2,500
Debt financing costs		1,000		1,000
Debt financing costs capitalized		$ 300		300
Interest Expense				$ 700
Iris Data Services Inc | Customer relationships
Intangible assets:
Fair value of intangible assets acquired	$ 15,400
Useful life	8 years
Iris Data Services Inc | Technology Member
Intangible assets:
Fair value of intangible assets acquired	$ 8,400
Useful life	3 years
Iris Data Services Inc | Trade names
Intangible assets:
Fair value of intangible assets acquired	$ 7,000
Useful life	10 years
Iris Data Services Inc | Non-compete agreements
Intangible assets:
Fair value of intangible assets acquired	$ 3,894
Iris Data Services Inc | Maximum | Non-compete agreements
Intangible assets:
Useful life	5 years
Iris Data Services Inc | Minimum | Non-compete agreements
Intangible assets:
Useful life	2 years