Significant Accounting Policies (Stock Transactions - Options Exercised Tables) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Significant Accounting Policies [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	11,667	19,950	11,667
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	$ 15,367	$ 67,417	$ 15,367
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options		62,445
Tax deduction realized from options exercised		$ 26,926