Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Consolidated Statements of Stockholders' Equity [Abstract]
Issuance of stock and related tax withholdings for vested restricted stock units (in shares)	230,624	211,328	200,688
Stock options exercised (in shares)			77,334
Common stock repurchase (in shares)			2,250,236
Conversion of Class B shares(in shares)	18	31,800
Dividends declared (in dollars per share)	$ 0.3700	$ 0.3225	$ 0.2550