Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies Goodwill (Details)

v3.7.0.1
Summary of Significant Accounting Policies Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]    
Goodwill $ 615,682 $ 615,515
Goodwill, Acquired During Period 0  
Goodwill, Written off Related to Sale of Business Unit 0  
Goodwill, Other Increase (Decrease) 167  
MEXICO    
Goodwill [Line Items]    
Goodwill 3,525 4,205
Goodwill, Acquired During Period 0  
Goodwill, Written off Related to Sale of Business Unit 0  
Goodwill, Other Increase (Decrease) (680)  
United States, Excluding All Points    
Goodwill [Line Items]    
Goodwill 580,420 580,420
Goodwill, Acquired During Period 0  
Goodwill, Written off Related to Sale of Business Unit 0  
Goodwill, Other Increase (Decrease) 0  
All Points Segment [Member]    
Goodwill [Line Items]    
Goodwill 3,360 3,360
Goodwill, Acquired During Period 0  
Goodwill, Written off Related to Sale of Business Unit 0  
Goodwill, Other Increase (Decrease) 0  
CANADA    
Goodwill [Line Items]    
Goodwill 28,377 $ 27,530
Goodwill, Acquired During Period 0  
Goodwill, Written off Related to Sale of Business Unit 0  
Goodwill, Other Increase (Decrease) $ 847