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Share and Unit-Based Plans - SARs (Details) (USD $)
 6 Months Ended
Jun. 30, 2014
SARs
  
SARs (in shares)  
Balance at beginning of period 1,070,991
Granted 0
Exercised (5,000)
Forfeited 0
Balance at end of period 1,065,991
Value (in dollars per share)  
Balance at beginning of period $ 56.66 [1]
Granted $ 0.00 [1]
Exercised $ 56.63 [1]
Forfeited $ 0.00 [1]
Balance at end of period $ 56.66 [1]
Stock options
  
Stock Options (in shares)  
Balance at beginning of period 10,068
Granted 0
Exercised 0
Forfeited 0
Balance at end of period 10,068
Value (in dollars per share)  
Balance at beginning of period $ 59.57 [1]
Granted $ 0.00 [1]
Exercised $ 0.00 [1]
Forfeited $ 0.00 [1]
Balance at end of period $ 59.57 [1]
[1] Value represents the weighted average exercise price.