Condensed Consolidated Statement Of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Issuance of common stock (in shares)	505,312	476,047	681,426
Issuance of deferred stock units (in shares)	36,578	43,188	3,776
Special cash dividend, per share		$ 2	$ 2.00