Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2015

Selected Quarterly Financial Data [Abstract]

Schedule Of Quarterly Results

							Attributable to stockholders
				Operating		Net		Net	Earnings per share
2015		Revenues		income		income		income		Basic		Diluted
First quarter	$	115,618	$	33,019	$	24,110	$	23,777	$	0.22	$	0.22
Second quarter		155,477		62,795		45,846		45,083		0.42		0.42
Third quarter		109,318		28,602		21,247		20,825		0.19		0.19
Fourth quarter		135,462		50,424		47,372		46,529		0.43		0.43

							Attributable to stockholders
				Operating		Net		Net	Earnings per share
2014		Revenues		income		income		income		Basic		Diluted
First quarter	$	98,588	$	19,081	$	13,435	$	13,174	$	0.12	$	0.12
Second quarter		141,835		51,773		37,536		37,008		0.35		0.34
Third quarter		102,217		15,903		9,643		9,382		0.09		0.09
Fourth quarter		138,457		41,170		31,949		31,417		0.29		0.29