Summary of Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2013 plan	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)
Accounting Policies [Abstract]
Estimated liabilities for unpaid claims		$ 8,855	$ 8,686
Number of defined benefit plans merged into current sponsored plan | plan	4
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accrued pension and retirement benefits		$ 11,605	5,318
Knoxville [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accrued pension and retirement benefits				$ 3,000
Memphis [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accrued pension and retirement benefits			$ 14,600