In 1999, the FCC modified its media ownership rules to count LMAs formed after November 5, 1996 that cover more than 15% of the broadcast day toward the ownership limits for the brokering station's owner. Even still, the related joint sales and shared services agreement structures became increasingly common during the 2000s; these outsourcing agreements proliferated between 2011 and 2013, when station owners such as Sinclair and the Nexstar Broadcasting Group began expanding their portfolios by acquiring additional stations in an effort to drive scale as well as to gain leverage in retransmission consent negotiations with cable and satellite television providers.