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Basis of Presentation (Stock-Based Compensation) (Details) (USD $)
3 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Long-Term Incentive Plan 2012
Mar. 31, 2014
Restricted Stock Units (RSUs)
Mar. 31, 2013
Restricted Stock Units (RSUs)
Mar. 11, 2014
Restricted Stock Units (RSUs)
Long-Term Incentive Plan 2005
Jan. 22, 2013
Restricted Stock Units (RSUs)
Long-Term Incentive Plan 2005
Mar. 31, 2014
Restricted Stock Units (RSUs)
Long-Term Incentive Plan 2005
equal_installments
Mar. 31, 2013
Restricted Stock Units (RSUs)
Long-Term Incentive Plan 2005
Mar. 11, 2014
Performance-Based Restricted Stock Units
Long-Term Incentive Plan 2005
Jan. 22, 2013
Performance-Based Restricted Stock Units
Long-Term Incentive Plan 2005
Mar. 31, 2014
Stock Option
Mar. 31, 2013
Stock Option
Dec. 31, 2008
Stock Option
Dec. 31, 2008
Stock Option
Period One
Dec. 31, 2008
Stock Option
Period Two
Dec. 31, 2008
Stock Option
Period Three
Stock-Based Compensation                                  
Number of shares for issuance under future awards     355,616                            
Equity instruments other than options, granted (in shares)           67,065 72,595 9,000 0 32,645 40,990            
Share-based compensation, award vesting periods               5 years             3 years 4 years 5 years
Award vesting, number of equal installments               3                  
Typical options expiration period after date of grant                           10 years      
Share-based compensation, award service periods                           5 years      
Vested options (in shares) 251,436 366,272                              
Vested options, weighted average exercise price (in dollars per share) $ 23.62 $ 22.76                              
Vested options, weighted average remaining contractual life 2 years 8 months 19 days                                
Intrinsic value for vested options $ 1,100,000                                
Intrinsic value for the total of all options exercised 39,000                                
Maximum exercise period 10 years                                
Cash received from options exercised 96,000 164,000                              
Tax benefit (expense) from equity based awards (138,000) 16,000                              
Share-based compensation costs       1,100,000 989,000             0 10,000        
Share-based unrecognized compensation costs       $ 4,000,000