Commitments and contingencies: (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and contingencies:

Schedule of future minimum annual payments under capital leases-fiber lease agreements

For the year ending December 31,
2016	$	19,857
2017		18,450
2018		18,270
2019		18,144
2020		18,127
Thereafter		197,812
Total minimum lease obligations		290,660
Less—amounts representing interest		(154,650	)
Present value of minimum lease obligations		136,010
Current maturities		(6,247	)
Capital lease obligations, net of current maturities	$	129,763

Schedule of future minimum annual payments under operating leases and building access agreements

For the year ending December 31,
2016	$	32,537
2017		22,980
2018		19,482
2019		16,639
2020		13,851
Thereafter		47,331
	$	152,820