Goodwill (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Roll Forward]
Balance, beginning of period	$ 338,695,000	$ 335,392,000	$ 496,265,000
Navvis purchase			21,527,000
Impairment loss			(182,400,000)
Ascentia purchase		3,303,000
Goodwill, Other Changes	105,000
Balance, end of period	338,800,000	338,695,000	335,392,000
Business Acquisition [Line Items]
Goodwill, Gross		521,100,000
Goodwill, Impaired, Accumulated Impairment Loss		182,400,000
Navvis & Company [Member]
Business Acquisition [Line Items]
Cash payment for the acquisition			23,700,000
Unregistered shares of common stock issued (in shares)			432,902
Value of common stock issued			3,300,000
Ascentia [Member]
Business Acquisition [Line Items]
Cash payment for the acquisition		5,500,000
Unregistered shares of common stock issued (in shares)		14,409
Value of common stock issued		$ 100,000