Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Stockholders' Equity [Abstract]
Interest rate swap, tax	$ (660)	$ 1,163	$ (1,152)
Treasury stock, shares of common stock (in shares)	1,810,383	2,164,986	3,033,733
Retirement of treasury shares (in shares)	(1,810,383)	(2,164,986)	(3,136,833)
Exercise and lapse of share-based awards, tax benefit	$ 4,611	$ 4,487	$ 3,118