Business Combinations (Details) - USD ($) $ in Thousands	Jul. 12, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition
Common stock, shares outstanding	146,910,648	150,529,151	64,024,557
Preferred stock, shares outstanding	9,194,233	6,194,233	0
Acquired debt		$ 1,365,347
Transaction costs		60,000
Assets acquired:
Goodwill		$ 747,325	$ 373,291	$ 359,459
Warrants
Business Acquisition
Warrants, shares outstanding	35,000,000	35,000,000
SourceHOV and Novitex
Business Acquisition
Acquired debt	$ 1,400,000
Novitex
Business Acquisition
Ownership percentage acquired	100.00%
Shares issued in business combination (in shares)	30,600,000
Amount of equity transactions	$ 244,800
Acquired debt	420,500
Transaction costs	10,300
Business acquisition, interest expense paid	1,000
Measurement period adjustment		$ 900
Assets acquired:
Cash and equivalents	8,428
Accounts receivable	87,474
Inventory	1,245
Prepaid expenses & other	13,974
Property, plant and equipment, net	60,657
Identifiable intangible assets, net	251,060
Deferred charges and other assets	2,723
Other noncurrent assets	93
Goodwill	406,060
Total identifiable assets acquired	831,714
Liabilities assumed:
Accounts payable	(29,444)
Short-term borrowings and current portion of long-term debt	(11,335)
Accrued liabilities	(30,432)
Advanced billings and customer deposits	(18,926)
Long term debt	(15,704)
Deferred taxes	(46,991)
Other liabilities	(2,226)
Total liabilities assumed	(155,058)
Total consideration	$ 676,656