Consolidated Statements of Stockholders' Equity (Parenthetical)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Phantom and restricted stock issuances (in shares)	393,818	11,323	193,602
Stock options exercised (in shares)	0	22,095	650,621
Share repurchase (in shares)		13,948,687	8,620,689
Common stock issued upon exchange of convertible securities (in shares)	3,664,729	1,323,322	900,290