XML 57 R45.htm IDEA: XBRL DOCUMENT v3.19.2
Fair Value of Financial Instruments - Carrying Value (Details) - Recurring - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Cash and cash equivalents $ 87,344 $ 192,248
Marketable securities    
Corporate debt securities 247 245
Long term marketable securities    
Corporate debt securities 454 445
U.S. government agency debt securities 0 0
Other non-current assets    
Marketable securities - restricted (SERP) 1 1
Total assets at fair value 88,046 192,939
Significant Other Observable Inputs (Level 2)    
Assets:    
Cash and cash equivalents 0 0
Marketable securities    
Corporate debt securities 170,975 163,525
Long term marketable securities    
Corporate debt securities 558,301 415,205
U.S. government agency debt securities 34,999 3,148
Other non-current assets    
Marketable securities - restricted (SERP) 386 325
Total assets at fair value 764,661 582,203
Total Fair Value    
Assets:    
Cash and cash equivalents 87,344 192,248
Marketable securities    
Corporate debt securities 171,222 163,770
Long term marketable securities    
Corporate debt securities 558,755 415,650
U.S. government agency debt securities 34,999 3,148
Other non-current assets    
Marketable securities - restricted (SERP) 387 326
Total assets at fair value $ 852,707 $ 775,142