Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Phantom and restricted stock issuances (in shares)	200,688	110,825	136,498
Stock options exercised (in shares)	77,334	27,619	0
Share repurchase (in shares)	2,250,236	1,752,454
Common Stock, Dividends, Per Share, Cash Paid	$ 0.255	$ 0.250	$ 0.240