Shareholders' Equity and Stock Options (Details)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of stock units and stock options outstanding under the Comprehensive Plan
Stock options	956,814	1,882,939	2,600,583
Restricted common stock units related to incentive compensation	1,663,190	1,423,611	1,135,840
Total	2,850,047	3,534,652	3,965,012
Employee Stock Option [Member]
Summary of stock units and stock options outstanding under the Comprehensive Plan
Common stock units related to deferred compensation	111,981	116,174	115,087
Restricted Stock Units (RSUs) [Member]
Summary of stock units and stock options outstanding under the Comprehensive Plan
Common stock units related to deferred compensation	118,062	111,928	113,502