Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 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	$ 501,000	$ 501,000
Remaining performance obligations expected to be recognized, year	2028	2028
Deferred revenue recognized	$ 11,300	$ 29,800
Restricted cash	3,100	3,100		$ 3,000
Proceeds from sale/maturity of short-term investments		28,753	$ 116,866
Short-term investments	17,674	17,674		$ 23,603
Equity method investments, additional investment		4,000
Equity method investment, carrying value	6,700	6,700
Operating lease right-of-use assets	94,028	94,028
Lease liabilities	$ 100,272	$ 100,272
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