CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Total incurred but not paid costs related to stock issue
Summary of non-cash investing and financing transactions:
Other significant noncash transactions	$ 0	$ 0	$ 470
Total incurred but not paid costs related to acquisition of businesses
Summary of non-cash investing and financing transactions:
Other significant noncash transactions	0	96	0
Series A-2 Convertible Redeemable Preferred Stock [Member]
Summary of non-cash investing and financing transactions:
Accretion of convertible redeemable preferred stock	$ 0	$ 0	$ 17,563