Saving and Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2017

Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]

Deferred Compensation Arrangement with Individual Disclosure, Postretirement Benefits [Table Text Block]

The following table reflects the balances of the assets and deferred compensation liabilities of the Rabbi trust in the accompanying Consolidated Balance Sheets:

Non Qualified Deferred Compensation Plan Component (1)	Year ended December 31,
(in thousands)	2017		2016
Assets:
Trading securities held in trust (2)	$	31,662	28,588
Liabilities:
Accounts payable and other liabilities	$	31,383	28,214
(1) Assets and liabilities of the Rabbi trust are exclusive of the shares of the Company's common stock.
(2)  Included within Other assets in the accompanying Consolidated Balance Sheets.