Summary of Quarterly Financial Information (unaudited) (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

The quarterly results of operations of our company for the years ended December 31, 2016, 2015 and 2014 are as follows (amounts in thousands):

	March 31, 2016		June 30, 2016		September 30, 2016		December 31, 2016
Revenues	$	157,074	$	165,815	$	175,848	$	179,263
Operating income	$	34,114	$	44,192	$	53,586	$	52,651
Net income	$	16,705	$	24,640	$	32,897	$	33,008
Net income attributable to common stockholders	$	7,428	$	11,089	$	15,973	$	16,966
Net income per share attributable to common stockholders:
Basic and diluted	$	0.06	$	0.09	$	0.12	$	0.11
	March 31, 2015		June 30, 2015		September 30, 2015		December 31, 2015
Revenues	$	151,882	$	164,773	$	175,779	$	165,200
Operating income	$	23,757	$	45,039	$	45,343	$	37,230
Net income	$	7,888	$	26,585	$	26,085	$	19,370
Net income attributable to common stockholders	$	3,138	$	11,120	$	11,220	$	8,252
Net income per share attributable to common stockholders:
Basic and diluted	$	0.03	$	0.10	$	0.10	$	0.07
	March 31, 2014		June 30, 2014		September 30, 2014		December 31, 2014
Revenues	$	140,306	$	155,168	$	169,441	$	170,411
Operating income	$	24,088	$	42,539	$	43,412	$	31,282
Net income	$	11,231	$	25,281	$	22,734	$	10,964
Net income attributable to common stockholders	$	4,369	$	9,834	$	8,322	$	4,142
Net income per share attributable to common stockholders:
Basic and diluted	$	0.05	$	0.10	$	0.09	$	0.04