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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income $ 139,838 $ 88,737
Adjustments to reconcile net income to net cash provided by operating activities (See Note 1) (35,664) (15,725)
Net cash provided by operating activities 104,174 73,012
Cash flows from investing activities:    
Additions to property and equipment (5,611) (3,205)
Additions to capitalized software (12,887) (16,861)
Purchases of marketable securities (15,466) (20,445)
Prepayments and maturities of marketable securities 18,588 15,166
Net cash used in investing activities (15,376) (25,345)
Cash flows from financing activities:    
Repayments under revolving credit facility (10,000) 0
Purchase and retirement of common stock (87,995) (56,553)
Proceeds from issuance of common stock 57,889 16,847
Payment of dividends (47,179) (44,597)
Net cash used in financing activities (87,285) (84,303)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 2,541 2,307
Net increase (decrease) in cash, cash equivalents and restricted cash 4,054 (34,329)
Cash, cash equivalents and restricted cash, beginning of period 747,752 699,201
Cash, cash equivalents and restricted cash, end of period $ 751,806 $ 664,872