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Stock-Based Compensation (Details 3)
shares in Thousands
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Restricted Stock Service Based [Member]  
Summary of non-vested stock options  
Non-vested Shares, Beginning Balance | shares 854
Shares Granted | shares 472
Shares Vested | shares (225)
Shares Forfeited | shares (62)
Non-vested Shares, Ending Balance | shares 1,039
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted average fair value, Beginning Balance | $ / shares $ 17.64
Weighted average fair value, Granted | $ / shares 18.55
Weighted average fair value, Vested | $ / shares 16.05
Weighted average fair value, Forfeited | $ / shares 20.49
Weighted average fair value, Ending Balance | $ / shares $ 18.23
Restricted Stock Units Service Based [Member]  
Summary of non-vested stock options  
Non-vested Shares, Beginning Balance | shares 68
Shares Granted | shares 66
Shares Vested | shares (52)
Shares Forfeited | shares 0
Non-vested Shares, Ending Balance | shares 82
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted average fair value, Beginning Balance | $ / shares $ 21.89
Weighted average fair value, Granted | $ / shares 19.44
Weighted average fair value, Vested | $ / shares 19.67
Weighted average fair value, Forfeited | $ / shares 0.00
Weighted average fair value, Ending Balance | $ / shares $ 21.32