XML 52 R41.htm IDEA: XBRL DOCUMENT v3.8.0.1
Recently Adopted and Recently Issued Accounting Standards - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Undiscounted future minimum rent commitments under noncancellable leases $ 42,700  
Additional discrete tax benefit 1,362 $ 2,386
Net Cash Provided by (Used in) Financing Activities (24,616) (106,436)
Accounting Standards Update 2016-09    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Additional discrete tax benefit 1,000 2,800
Accounting Standards Update 2016-16    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Cumulative-effect adjustment to retained earnings   5,915
Accounting Standards Update 2016-18    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net Cash Provided by (Used in) Financing Activities   400
Accounting Standards Update 2017-07    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Decrease in operating income $ 1,400 $ 800