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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Statement of Comprehensive Income [Abstract]    
Net income $ 8,678 $ 7,059
Company sponsored benefit plans: (39) (17)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Investments Transferred from Available-for-sale to Equity Method, Net of Tax (2) 0
Other comprehensive loss (41) (17)
Comprehensive income $ 8,637 $ 7,042