Non-Qualified Deferred Compensation Plan (Tables)

3 Months Ended

Mar. 31, 2016

Asset Retirement Obligation Disclosure [Abstract]

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)
(in thousands)	March 31, 2016		December 31, 2015
Assets:
Trading securities held in trust	$	29,615	29,093
Liabilities:
Accounts payable and other liabilities	$	29,176	28,632

⁽¹⁾ Assets and liabilities of the Rabbi trust exclude shares of the Company's common stock.