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Share-Based Compensation (Narrative) (Details) (USD $)
 12 Months Ended 12 Months Ended 48 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Equity Incentive Stock Option Plans [Member]
Dec. 31, 2012
Equity Incentive Stock Option Plans [Member]
Dec. 31, 2011
Equity Incentive Stock Option Plans [Member]
Dec. 31, 2013
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2013
ESPP [Member]
Dec. 31, 2012
ESPP [Member]
Dec. 31, 2011
ESPP [Member]
Apr. 12, 2011
ESPP [Member]
offering
Feb. 12, 2004
ESPP [Member]
offering
Jan. 01, 2000
ESPP [Member]
offering
Dec. 31, 2013
SERP [Member]
Dec. 31, 2012
SERP [Member]
Dec. 31, 2011
SERP [Member]
Dec. 31, 2010
SERP [Member]
Dec. 31, 2013
SERP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Stock-based compensation expense $ 2,607,000 [1] $ 2,538,000 [1] $ 2,152,000 [1]       $ 28,000 $ 0 $ 0 $ 562,000 $ 641,000 $ 282,000       $ 538,000 $ 560,000 $ 444,000    
Percentage of match participants' deferrals                               25.00%     25.00%  
Common stock reserved for future issuance       5,277,000                                
Maximum term of grants         10 years                              
Options vested and exercisable, period, in years         5 years                              
Weighted average grant-date fair value of stock options granted (in dollars per share)       $ 6.81 $ 4.74 $ 3.26                            
Shares granted during period             6,000                          
Weighted average grant-date fair value of restricted stock granted (in dollars per share)             $ 23.50                          
Period of expense of unrecognized compensation cost, years 4 years 4 years 4 years                                  
Number of initial offerings                             5          
Number of additional offerings                         5 8            
Stock options authorized to issue to employees                   4,050,000                    
Shares available for future grant       2,793,000           2,476,000                    
Annual earnings withheld to purchase common stock                   21,250                    
Percent of IRS limitation                   85.00%                    
Maximum fair value of common stock purchased                   $ 25,000                    
Percentage of stock purchase price                   85.00%                    
Percentage of earned income on a pre-tax basis, deferred                                     25.00%  
Percentage of deferral in the form of common stock                                     15.00%  
Stock options authorized to issue                               1,013,000       1,013,000
Common stock reserved for future issuance                               452,000       452,000
Shares exercised and delivered                               19,000       19,000
Shares issued to trustee                                       560,000
Stock options vested and outstanding                               311,000       311,000
[1] Stock-based compensation expense is recorded in the selling, general and administrative caption in our consolidated statements of comprehensive income.