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Stockholders' Equity Share Repurchase Program (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Repurchase Program [Line Items]      
Common stock repurchase authorization amount available $ 98,100,000    
Common stock repurchase authorized amount     150,000,000
Common stock repurchased and retired, shares 171,263 1,507,659 4,824,021
Common stock repurchased and retired, weighted average price per share $ 45.54 $ 29.96 $ 25.51
Common stock repurchased and retired, total value $ 7,799,000 $ 45,162,000 $ 123,077,000