Pension Plans (Contributions) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Qualified Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Contributions		$ 10,000	$ 10,000
Expected contributions during 2017	[1]	10,000
SERP
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block
Contributions		534	$ 534
Expected contributions during 2017		$ 3,061

[1] The Company contributed $10.0 million to the qualified pension plan in January 2017 and does not intend to make any further contributions to the qualified pension plan in 2017.