Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items]
Aggregate amount of transaction price allocated to remaining performance obligations	$ 454,000	$ 454,000
Remaining performance obligations expected to be recognized, year	2028	2028
Deferred revenue recognized	$ 5,700	$ 35,500
Restricted cash	2,800	2,800		$ 3,000
Proceeds from sale/maturity of short-term investments		38,029	$ 190,467
Short-term investments	11,337	11,337		$ 23,603
Equity method investments, additional investment		4,000
Equity method investment, carrying value	6,600	6,600
Operating lease right-of-use assets	92,949	92,949
Lease liabilities	$ 99,462	$ 99,462
ASU 2016-02
Summary Of Significant Accounting Policies [Line Items]
Operating lease right-of-use assets					$ 80,000
Lease liabilities					$ 80,000
Payment Technology and Services Company
Summary Of Significant Accounting Policies [Line Items]
Equity method investment, noncontrolling interest	8.00%	8.00%
Maximum
Summary Of Significant Accounting Policies [Line Items]
Short-term investment contractual maturities		2 years		2 years
Cloud and Related Solutions Revenue | Minimum
Summary Of Significant Accounting Policies [Line Items]
Future revenue including variable consideration, contractual terms ending, year		2019
Cloud and Related Solutions Revenue | Maximum
Summary Of Significant Accounting Policies [Line Items]
Future revenue including variable consideration, contractual terms ending, year		2028