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Fair Value Measurements - Hierarchy (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Assets          
Cash and cash equivalents $ 246,125 $ 211,433      
Marketable securities 3,111 12,506 $ 16,973 $ 62,274 $ 63,713
Marketable securities 0 2,974 $ 3,968 $ 13,949 $ 17,934
Total assets 249,236 226,913      
Liabilities          
Contingent consideration obligation   2,833      
Contingent interest derivative (3) 193        
Mandatorily redeemable financial instrument 37,959 0      
Total liabilities 38,152 2,833      
Temporary Equity          
Redeemable noncontrolling interests (5) 25,280 25,280      
Total temporary equity 25,280 25,280      
Level 1          
Assets          
Cash and cash equivalents 246,125 211,433      
Marketable securities 0 0      
Marketable securities   0      
Total assets 246,125 211,433      
Liabilities          
Contingent consideration obligation   0      
Total liabilities 0 0      
Temporary Equity          
Redeemable noncontrolling interests (5) 0 0      
Total temporary equity 0 0      
Level 2          
Assets          
Cash and cash equivalents 0 0      
Marketable securities 3,111 12,506      
Marketable securities   2,974      
Total assets 3,111 15,480      
Liabilities          
Contingent consideration obligation   0      
Total liabilities 0 0      
Temporary Equity          
Redeemable noncontrolling interests (5) 0 0      
Total temporary equity 0 0      
Level 3          
Assets          
Cash and cash equivalents 0 0      
Marketable securities 0 0      
Marketable securities   0      
Total assets 0 0      
Liabilities          
Contingent consideration obligation   2,833      
Contingent interest derivative (3) 193        
Mandatorily redeemable financial instrument 37,959        
Total liabilities 38,152 2,833      
Temporary Equity          
Redeemable noncontrolling interests (5) 25,280 25,280      
Total temporary equity $ 25,280 $ 25,280