Consolidated Statement of Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred Income Tax Expense (Benefit)	$ 11,884	$ 12,319	$ 22,412
Additional Paid-in Capital [Member]
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	$ 2,993	$ 1,841	$ 2,142