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Summarized Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Selected Quarterly Financial Information [Abstract]
Revenues	$ 113,660	$ 99,142	$ 109,750	$ 111,885	$ 116,070	$ 100,756	$ 112,747	$ 116,468	$ 434,437	$ 446,041	$ 503,600
Income from operations	21,656	7,254	20,929	19,859	22,624	9,216	23,998	25,909	69,698	81,747	32,701
Net income	$ 13,041	$ 3,723	$ 11,874	$ 11,385	$ 12,943	$ 4,953	$ 13,677	$ 14,783	$ 40,023	$ 46,356	$ 16,425
Net income per share:
Basic	$ 1.23	$ 0.35	$ 1.12	$ 1.08	$ 1.22	$ 0.47	$ 1.29	$ 1.40	$ 3.78	$ 4.39	$ 1.55
Diluted	$ 1.21	$ 0.35	$ 1.11	$ 1.06	$ 1.21	$ 0.46	$ 1.29	$ 1.40	$ 3.73	$ 4.35	$ 1.55

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.