Acquisitions (Details) (USD $) In Thousands, unless otherwise specified			0 Months Ended	1 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Jun. 12, 2013 Lorien [Member]	May 31, 2013 Prospero [Member]
Business Acquisition [Line Items]
Cash purchase price paid at closing			$ 6,734	$ 7,046
Fair value of contingent consideration			573	3,670
Total estimated purchase price			7,307	10,716
Cash			23
Accounts receivable			1,856
Prepaid expenses and other assets			1,553	29
Property and equipment			116	51
Amortizable intangible assets			1,715	2,801
Goodwill	116,707	102,821	5,443	8,115
Total assets acquired			10,706	10,996
Accounts payable, accrued expenses and other liabilities			3,004	280
Deferred tax liability			395
Total liabilities assumed			3,399	280
Net assets acquired			$ 7,307	$ 10,716