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Defined Benfit Plan (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Dec. 31, 2013
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Mar. 31, 2014
Significant Observable Inputs, Level 2 [Member]
Dec. 31, 2013
Significant Observable Inputs, Level 2 [Member]
Mar. 31, 2014
Significant Unobservable Inputs, Level 3 [Member]
Dec. 31, 2013
Significant Unobservable Inputs, Level 3 [Member]
Mar. 31, 2014
Equity Securities [Member]
Dec. 31, 2013
Equity Securities [Member]
Mar. 31, 2014
Fixed Income Securities [Member]
Dec. 31, 2013
Fixed Income Securities [Member]
Mar. 31, 2014
Cash and cash equivalents [Member]
Dec. 31, 2013
Cash and cash equivalents [Member]
Mar. 31, 2014
Cash and cash equivalents [Member]
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Dec. 31, 2013
Cash and cash equivalents [Member]
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Mar. 31, 2014
Cash and cash equivalents [Member]
Significant Observable Inputs, Level 2 [Member]
Dec. 31, 2013
Cash and cash equivalents [Member]
Significant Observable Inputs, Level 2 [Member]
Mar. 31, 2014
Cash and cash equivalents [Member]
Significant Unobservable Inputs, Level 3 [Member]
Dec. 31, 2013
Cash and cash equivalents [Member]
Significant Unobservable Inputs, Level 3 [Member]
Mar. 31, 2014
Actively Managed [Member]
All Cap Equity Fund [Member]
Dec. 31, 2013
Actively Managed [Member]
All Cap Equity Fund [Member]
Mar. 31, 2014
Actively Managed [Member]
All Cap Equity Fund [Member]
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Dec. 31, 2013
Actively Managed [Member]
All Cap Equity Fund [Member]
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Mar. 31, 2014
Actively Managed [Member]
All Cap Equity Fund [Member]
Significant Observable Inputs, Level 2 [Member]
Dec. 31, 2013
Actively Managed [Member]
All Cap Equity Fund [Member]
Significant Observable Inputs, Level 2 [Member]
Mar. 31, 2014
Actively Managed [Member]
All Cap Equity Fund [Member]
Significant Unobservable Inputs, Level 3 [Member]
Dec. 31, 2013
Actively Managed [Member]
All Cap Equity Fund [Member]
Significant Unobservable Inputs, Level 3 [Member]
Mar. 31, 2014
Actively Managed [Member]
U.S. Large Cap Equity [Member]
Dec. 31, 2013
Actively Managed [Member]
U.S. Large Cap Equity [Member]
Mar. 31, 2014
Actively Managed [Member]
U.S. Large Cap Equity [Member]
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Dec. 31, 2013
Actively Managed [Member]
U.S. Large Cap Equity [Member]
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Mar. 31, 2014
Actively Managed [Member]
U.S. Large Cap Equity [Member]
Significant Observable Inputs, Level 2 [Member]
Dec. 31, 2013
Actively Managed [Member]
U.S. Large Cap Equity [Member]
Significant Observable Inputs, Level 2 [Member]
Mar. 31, 2014
Actively Managed [Member]
U.S. Large Cap Equity [Member]
Significant Unobservable Inputs, Level 3 [Member]
Dec. 31, 2013
Actively Managed [Member]
U.S. Large Cap Equity [Member]
Significant Unobservable Inputs, Level 3 [Member]
Mar. 31, 2014
Actively Managed [Member]
U.S. Mid Cap Equity [Member]
Dec. 31, 2013
Actively Managed [Member]
U.S. Mid Cap Equity [Member]
Mar. 31, 2014
Actively Managed [Member]
U.S. Mid Cap Equity [Member]
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Dec. 31, 2013
Actively Managed [Member]
U.S. Mid Cap Equity [Member]
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Mar. 31, 2014
Actively Managed [Member]
U.S. Mid Cap Equity [Member]
Significant Observable Inputs, Level 2 [Member]
Dec. 31, 2013
Actively Managed [Member]
U.S. Mid Cap Equity [Member]
Significant Observable Inputs, Level 2 [Member]
Mar. 31, 2014
Actively Managed [Member]
U.S. Mid Cap Equity [Member]
Significant Unobservable Inputs, Level 3 [Member]
Dec. 31, 2013
Actively Managed [Member]
U.S. Mid Cap Equity [Member]
Significant Unobservable Inputs, Level 3 [Member]
Mar. 31, 2014
Actively Managed [Member]
U.S. Small Cap Equity [Member]
Dec. 31, 2013
Actively Managed [Member]
U.S. Small Cap Equity [Member]
Mar. 31, 2014
Actively Managed [Member]
U.S. Small Cap Equity [Member]
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Dec. 31, 2013
Actively Managed [Member]
U.S. Small Cap Equity [Member]
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Mar. 31, 2014
Actively Managed [Member]
U.S. Small Cap Equity [Member]
Significant Observable Inputs, Level 2 [Member]
Dec. 31, 2013
Actively Managed [Member]
U.S. Small Cap Equity [Member]
Significant Observable Inputs, Level 2 [Member]
Mar. 31, 2014
Actively Managed [Member]
U.S. Small Cap Equity [Member]
Significant Unobservable Inputs, Level 3 [Member]
Dec. 31, 2013
Actively Managed [Member]
U.S. Small Cap Equity [Member]
Significant Unobservable Inputs, Level 3 [Member]
Mar. 31, 2014
Actively Managed [Member]
Non-U.S. Large Cap Equity [Member]
Dec. 31, 2013
Actively Managed [Member]
Non-U.S. Large Cap Equity [Member]
Mar. 31, 2014
Actively Managed [Member]
Non-U.S. Large Cap Equity [Member]
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Dec. 31, 2013
Actively Managed [Member]
Non-U.S. Large Cap Equity [Member]
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Mar. 31, 2014
Actively Managed [Member]
Non-U.S. Large Cap Equity [Member]
Significant Observable Inputs, Level 2 [Member]
Dec. 31, 2013
Actively Managed [Member]
Non-U.S. Large Cap Equity [Member]
Significant Observable Inputs, Level 2 [Member]
Mar. 31, 2014
Actively Managed [Member]
Non-U.S. Large Cap Equity [Member]
Significant Unobservable Inputs, Level 3 [Member]
Dec. 31, 2013
Actively Managed [Member]
Non-U.S. Large Cap Equity [Member]
Significant Unobservable Inputs, Level 3 [Member]
Mar. 31, 2014
Actively Managed [Member]
REIT [Member]
Dec. 31, 2013
Actively Managed [Member]
REIT [Member]
Mar. 31, 2014
Actively Managed [Member]
REIT [Member]
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Dec. 31, 2013
Actively Managed [Member]
REIT [Member]
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Mar. 31, 2014
Actively Managed [Member]
REIT [Member]
Significant Observable Inputs, Level 2 [Member]
Dec. 31, 2013
Actively Managed [Member]
REIT [Member]
Significant Observable Inputs, Level 2 [Member]
Mar. 31, 2014
Actively Managed [Member]
REIT [Member]
Significant Unobservable Inputs, Level 3 [Member]
Dec. 31, 2013
Actively Managed [Member]
REIT [Member]
Significant Unobservable Inputs, Level 3 [Member]
Mar. 31, 2014
Fixed Income [Member]
Dec. 31, 2013
Fixed Income [Member]
Mar. 31, 2014
Fixed Income [Member]
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Dec. 31, 2013
Fixed Income [Member]
Quoted Prices in Active Markets for Identical Assets, Level 1 [Member]
Mar. 31, 2014
Fixed Income [Member]
Significant Observable Inputs, Level 2 [Member]
Dec. 31, 2013
Fixed Income [Member]
Significant Observable Inputs, Level 2 [Member]
Mar. 31, 2014
Fixed Income [Member]
Significant Unobservable Inputs, Level 3 [Member]
Dec. 31, 2013
Fixed Income [Member]
Significant Unobservable Inputs, Level 3 [Member]
Components of Net Periodic Benefit Cost [Abstract]                                                                                                                                                          
Service cost $ 1,059 $ 1,239                                                                                                                                                      
Interest cost 1,651 1,475                                                                                                                                                      
Other cost 632 1,208                                                                                                                                                      
Expected return on assets (1,667) (1,380)                                                                                                                                                      
Net periodic benefit cost 1,675 2,542                                                                                                                                                      
Plan Assets [Abstract]                                                                                                                                                          
Fair value of plan assets 95,560   95,353 54,684 55,532 40,876 39,821 0 0         4,191 9,127 4,191 9,127 0 0 0 0 2,533 [1] 283 [1] 2,510 [1] 266 [1] 23 [1] 17 [1] 0 [1] 0 [1] 34,283 [1] 32,286 [1] 34,283 [1] 32,286 [1] 0 [1] 0 [1] 0 [1] 0 [1] 5,627 [1] 5,551 [1] 5,627 [1] 5,551 [1] 0 [1] 0 [1] 0 [1] 0 [1] 3,068 [1] 3,236 [1] 3,068 [1] 3,236 [1] 0 [1] 0 [1] 0 [1] 0 [1] 5,005 [1] 5,066 [1] 5,005 [1] 5,066 [1] 0 [1] 0 [1] 0 [1] 0 [1] 4,325 [1] 3,913 [1] 0 [1] 0 [1] 4,325 [1] 3,913 [1] 0 [1] 0 [1] 36,528 [2] 35,891 [2] 0 [2] 0 [2] 36,528 [2] 35,891 [2] 0 [2] 0 [2]
Target plan asset allocations                   55.00% 55.00% 45.00% 45.00%                                                                                                                                
Employer Contributions [Abstract]                                                                                                                                                          
Estimated employer contributions for the current fiscal year $ 7,800                                                                                                                                                        
[1] Actively managed portfolio of securities with the goal to exceed the stated benchmark performance.
[2] Actively managed portfolio of fixed income securities with the goal to exceed the Barclays 1-5 Year Government/Credit, Barclays Intermediate Government/Credit, and Merrill Lynch Preferred Stock Fixed Rate.