Summary of Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019	Jan. 01, 2018	Dec. 31, 2014
Summary Of Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]		true	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date		Jan. 31, 2019	Jan. 01, 2018
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201602Member	us-gaap:AccountingStandardsUpdate201409Member
Retained earnings	$ 876,402	$ 848,623
Aggregate amount of transaction price allocated to remaining performance obligations	$ 1,000,000
Remaining performance obligations expected to be recognized, year	2028
Restricted cash	$ 1,700	2,700
Proceeds from sale/maturity of short-term investments	56,454	52,135	$ 190,778
Research and development	122,847	127,994	$ 124,034
Common stock warrants issued, per warrant						$ 26.68
Equity method investments, additional investment	1,500
Equity method investment, carrying value	7,900	6,600
Operating lease right-of-use assets	110,756	$ 94,847
Lease liabilities	$ 118,577
Payment Technology and Services Company
Summary Of Significant Accounting Policies [Line Items]
Equity method investment, noncontrolling interest	15.00%	8.00%
Common stock Warrants
Summary Of Significant Accounting Policies [Line Items]
Common stock warrants issued, per warrant	$ 26.68
Minimum
Summary Of Significant Accounting Policies [Line Items]
Billed accounts receivable, payment term	30 days
Property and equipment, useful lives	3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Billed accounts receivable, payment term	60 days
Short-term investment contractual maturities	2 years	2 years
Property and equipment, useful lives	10 years
Cloud and Related Solutions Revenue | Minimum
Summary Of Significant Accounting Policies [Line Items]
Long-term arrangements service period	3 years
Future revenue including variable consideration, contractual terms ending, year	2021
Cloud and Related Solutions Revenue | Maximum
Summary Of Significant Accounting Policies [Line Items]
Long-term arrangements service period	5 years
Future revenue including variable consideration, contractual terms ending, year	2028
Managed Services Solutions | Minimum
Summary Of Significant Accounting Policies [Line Items]
Long-term arrangements service period	3 years
Managed Services Solutions | Maximum
Summary Of Significant Accounting Policies [Line Items]
Long-term arrangements service period	5 years
ASC 606
Summary Of Significant Accounting Policies [Line Items]
Retained earnings					$ 7,000
ASU 2016-02
Summary Of Significant Accounting Policies [Line Items]
Operating lease right-of-use assets				$ 80,000
Lease liabilities				$ 80,000