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Stock-based Compensation Expense Restricted and Performance Stock Unit Activity (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures [Abstract]      
Outstanding, Units 440,562 491,404 465,428
Outstanding, Weighted Average Grant Date Fair Value $ 22.54 $ 18.54 $ 17.88
Granted, Units 183,071 186,495 152,657
Granted, Weighted Average Grant Date Fair Value $ 29.25 $ 24.72 $ 23.84
Forfeited, Units (7,007) (22,947) (106,979)
Forfeited, Weighted Average Grant Date Fair Value $ 27.15 $ 18.95 $ 22.35
Vested, Units (185,536) (214,390) (19,702)
Vested, Weighted Average Grant Date Fair Value $ 20.20 $ 15.67 $ 23.34
Outstanding, Units 431,090 440,562 491,404
Outstanding, Weighted Average Grant Date Fair Value $ 26.31 $ 22.54 $ 18.54