Employee Benefits - Equity Incentive Plans (Details)				12 Months Ended
	Jun. 30, 2010 shares	May. 18, 2007 shares	Jun. 21, 2006 shares	Dec. 31, 2015 item shares	Dec. 31, 2014 shares	Jul. 14, 2014 shares	Dec. 31, 2013 shares
Employee Benefits
Options outstanding				292,757	362,500
Number of stock option plans frozen | item				3
Employee And Directors Time Based Options
Employee Benefits
Number of options granted				162,500	14,042
Options outstanding				1,081,901	1,096,774		1,099,264
2014 Plan
Employee Benefits
Number of shares or units authorized for grants						1,273,838
2014 Plan | Employee And Directors Time Based Options
Employee Benefits
Options outstanding				173,500	11,000
2010 Option Plan | Employee And Directors Stock Options
Employee Benefits
Number of shares or units authorized for grants	2,239,906
Vesting period	4 years
2010 Option Plan | Employee And Directors Time Based Options
Employee Benefits
Options outstanding				381,071	425,996
2010 Option Plan | Employee And Directors Performance Options
Employee Benefits
Number of options granted				11,958
Options outstanding				1,223,234	1,277,990
2010 Option Plan | Employee And Directors Super Performance Options
Employee Benefits
Options outstanding				375,529	396,521
2006 Option Plan
Employee Benefits
Number of shares or units authorized for grants			450,000
Vesting period			4 years
Term of awards			10 years
Redstone Option Plan
Employee Benefits
Options outstanding				234,573	297,278
SAR Plan
Employee Benefits
Number of shares or units authorized for grants		200,000
Units outstanding				103,000	134,000
Term of awards		10 years