XML 101 R88.htm IDEA: XBRL DOCUMENT v3.10.0.1
Income Taxes - Balances of Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Unrecognized tax benefits $ 41,110 $ 36,229 $ 35,240 $ 54,541
Portion that, if recognized, would reduce tax expense and effective tax rate 40,977 35,561 33,128  
Accrued interest on unrecognized tax benefits 5,459 5,368 5,539  
Accrued penalties on unrecognized tax benefits 631 631 650  
Minimum        
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months 0 0 0  
Portion that, if recognized, would reduce tax expense and effective tax rate 0 0 0  
Maximum        
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]        
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months 9,541 13,655 12,332  
Portion that, if recognized, would reduce tax expense and effective tax rate $ 8,224 $ 12,483 $ 10,983