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Stock Based Plans - Summary of Nonvested Phantom Stock Units (Details) - $ / shares
6 Months Ended
Feb. 15, 2019
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]    
Nonvested Units, Beginning balance   17,805
Nonvested Units, Granted   6,050
Nonvested Units, Vested   (8,220)
Nonvested Units, Forfeited  
Nonvested Units, Cancelled  
Nonvested Units, Ending Balance   15,635
Phantom Stock Unit Awards Expected to Vest, Units   15,635
Nonvested Weighted Average Grant Date Fair Value, Beginning balance   $ 46.08
Nonvested Weighted Average Grant Date Fair Value, Granted $ 65.40 65.40
Nonvested Weighted Average Grant Date Fair Value, Vested   39.94
Nonvested Weighted Average Grant Date Fair Value, Forfeited  
Nonvested Weighted Average Grant Date Fair Value, Cancelled  
Nonvested Weighted Average Grant Date Fair Value, Ending Balance   56.79
Phantom Stock Unit Awards Expected to Vest, Weighted Average Grant Date Fair Value   $ 56.79