Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details)

v3.8.0.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recent Accounting Pronouncements (Details) - Accounting Standards Update 2016-09 - Adjustment
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Federal jurisdiction  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Effective income tax rate reconciliation, share-baseed compensation, excess tax benefit amount $ 4.1
State jurisdiction  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Effective income tax rate reconciliation, share-baseed compensation, excess tax benefit amount $ 1.4