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Employee Benefit Plans Summary of ARX employee stock option plans (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Apr. 01, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value   $ 1.1  
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to unvested equity awards $ 1.6 $ 2.9  
Period of recognition of compensation expense related to unvested equity awards 1 year 4 months 10 days 1 year 8 months 20 days  
Employee Stock Option | ARX employee [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value $ 607.95 $ 665.85  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 24,995 24,995 26,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price $ 526.46 $ 526.46 $ 513.72
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares 8,000 12,000 14,800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value $ 712.74 $ 677.81 $ 675.55
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (4,000) (2,800)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0 (1,005)  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price $ 0.00 $ 197.01  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number 16,995 12,995  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 438.77 $ 386.69