XML 97 R65.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock-Based Compensation (Details 4) - Performance Shares [Member] - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 2,368,281 2,372,632 1,135,135 516,830
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 4.44 $ 4.53 $ 10.35 $ 17.61
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 316,213 1,437,077 809,293  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 11.58 $ 1.79 $ 6.97  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 66,696      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 14.18      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period 253,868 199,580 190,988  
Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Option Forfeited in Period Weighted Average Grant Date Fair Value $ 11.56 $ 17.98 $ 15.62