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Common Stock COMMON STOCK Restricted Stock - Market Based Awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Shares Payout Range 0.00%    
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Shares Payout Range 200.00%    
Restricted Stock - Market Based Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award The fair value of the market-based PSUs is amortized ratably over the requisite service period, primarily three years. The market-based shares vest if the participant is continuously employed throughout the performance period and the market-based performance measure is achieved, with a maximum vesting period of three years. All compensation cost related to the market-based awards will be recognized if the requisite service period is fulfilled, even if the market condition is not achieved.    
Market based performance shares granted to executives 139,197    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 3 years 3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 2.50% 2.40%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 41.40% 42.30%  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 242,111   102,914
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 139,197    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 64.42   $ 74.88
Aggregate intrinsic value of non-vested awards $ 6,719 $ 6,805  
Share Price $ 27.75 $ 48.96  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 56.68 $ 69.98  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 8,900    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 1 year 8 months 12 days