Consolidated Statements of Stockholders' Deficit (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash dividend per share	$ 0.90	$ 0.90	$ 0.675
Other comprehensive income (loss), tax	$ 19,903	$ 13,662	$ (6,700)
Purchase of stock at cost, shares	2,000,000
Executive Deferred Compensation Plan activity, shares distributed	204,323	62,489	63,773
Issuance of common stock in connection with initial public offering, shares			21,275,000
Stock options exercised including related tax benefits	413,008	112,216	218,872
Shares issued from the Employee Stock Purchase Plan	286,141	271,255
Retained Deficit [Member]
Cash dividend per share	$ 0.90	$ 0.90	$ 0.675
Accumulated Other Comprehensive Income (Loss) [Member]
Other comprehensive income (loss), tax	$ 19,903	$ 13,662	$ (6,700)