Employee Benefits (Details)	Jun. 30, 2010 shares	Jun. 21, 2006 shares	Sep. 30, 2015 item shares	Dec. 31, 2014 shares
Stock Options
Number of stock option plans frozen | item			3
Employee And Directors Time Based Options
Stock Options
Options outstanding				425,996
Employee And Directors Performance Options
Stock Options
Options outstanding				1,674,511
2014 Plan
Stock Options
Options outstanding			41,000	11,000
2010 Option Plan | Employee And Directors Stock Options
Employee Benefits
Number of shares or units authorized for grants	2,239,906
Stock Options
Vesting period	4 years
2010 Option Plan | Employee And Directors Time Based Options
Stock Options
Options outstanding			389,859
2010 Option Plan | Employee And Directors Performance Options
Stock Options
Options outstanding			1,604,756
2006 Option Plan
Employee Benefits
Number of shares or units authorized for grants		450,000
Stock Options
Options outstanding			302,757	362,500
Vesting period		4 years
Term of awards		10 years
Redstone Option Plan
Stock Options
Options outstanding			285,322	297,278