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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Assets      
Restricted cash $ 133,597 $ 215,325 $ 236,696
Investments 326,165 267,654  
Cash held in bank accounts by the Company, unrestricted 109,400 116,000  
Cash held in bank accounts by the Company, restricted 50,800 149,300  
Liabilities      
Contingent consideration 92,426 58,153  
Level 2 | Term Loan      
Liabilities      
Fair value of debt 234,400    
Fair value measured on recurring basis      
Assets      
Total assets held at fair value 414,982 472,926  
Liabilities      
Contingent consideration 92,426 58,153  
Total liabilities held at fair value 92,426 58,153  
Fair value measured on recurring basis | Other than cash held in bank accounts by Company      
Assets      
Cash and cash equivalents 6,009 139,280  
Restricted cash 82,808 65,992  
Fair value measured on recurring basis | U.S. Government and agency securities      
Assets      
Investments 5,514 4,303  
Fair value measured on recurring basis | Obligations of government-sponsored enterprises      
Assets      
Investments 50,525 15,315  
Fair value measured on recurring basis | Corporate debt securities      
Assets      
Investments 268,976 246,886  
Fair value measured on recurring basis | Certificates of deposit      
Assets      
Investments 1,150 1,150  
Fair value measured on recurring basis | Level 1      
Assets      
Total assets held at fair value 5,514 4,303  
Fair value measured on recurring basis | Level 1 | U.S. Government and agency securities      
Assets      
Investments 5,514 4,303  
Fair value measured on recurring basis | Level 2      
Assets      
Total assets held at fair value 409,468 468,623  
Fair value measured on recurring basis | Level 2 | Other than cash held in bank accounts by Company      
Assets      
Cash and cash equivalents 6,009 139,280  
Restricted cash 82,808 65,992  
Fair value measured on recurring basis | Level 2 | Obligations of government-sponsored enterprises      
Assets      
Investments 50,525 15,315  
Fair value measured on recurring basis | Level 2 | Corporate debt securities      
Assets      
Investments 268,976 246,886  
Fair value measured on recurring basis | Level 2 | Certificates of deposit      
Assets      
Investments 1,150 1,150  
Fair value measured on recurring basis | Level 3      
Liabilities      
Contingent consideration 92,426 58,153  
Total liabilities held at fair value $ 92,426 $ 58,153