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Unaudited Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Unaudited Consolidated Statements of Cash Flows [Abstract]    
Net cash provided by operating activities $ 22,741 $ 14,163
Investing activities:    
Purchases of available-for-sale investments (215,228) (183,337)
Proceeds from sales or maturities of available-for-sale investments 188,245 166,964
Net sales of short-term investments 720 747
Other investing activities (1,112) 1,039
Net cash used in investing activities (27,375) (14,587)
Financing activities:    
Dividends paid to shareholders (7,902) (7,530)
Net cash used in financing activities (7,902) (7,530)
Effect of foreign exchange rates on cash and cash equivalents 543 (673)
Decrease in cash and cash equivalents (11,993) (8,627)
Cash and cash equivalents at beginning of period 73,538 64,632
Cash and cash equivalents at end of period $ 61,545 $ 56,005