Segment Information - Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 297,561	$ 287,480
Less adjustments:
Depreciation and amortization of property and equipment	61,300	53,665
Amortization of capitalized implementation costs	9,189	8,488
Acquisition related amortization	35,181	34,130
Amortization of upfront incentive consideration	16,132	12,337
Interest expense, net	39,561	41,202
Other, net	15,234	(3,360)
Restructuring and other costs	0	124
Acquisition-related costs	0	108
Litigation costs, net	3,501	(3,846)
Stock-based compensation expense	8,034	10,289
Provision for income taxes	31,707	41,424
Income from continuing operations	77,722	92,919
Gain recognized on receipt of earn out payment		6,000
Loss on modification of debt	$ 11,730	$ 0
Minimum [Member]
Less adjustments:
Average expected life of the service contract to cost of revenue	3 years
Maximum [Member]
Less adjustments:
Average expected life of the service contract to cost of revenue	5 years

Income (loss) from continuing operations adjusted for impairment, acquisition related amortization expense, gain (loss) on sale of business and assets, gain (loss) on extinguishment of debt, other, net, restructuring and other costs, litigation and taxes including penalties, stock-based compensation, management fees, amortization of Expedia SMA incentive payments, depreciation of fixed assets, non-acquisition related amortization, amortization of upfront incentive consideration, interest expense, and income taxes.

No definition available.