Commitments and Contingencies Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]

The annual minimum payments for the next five years and total minimum payments thereafter are presented below:

Years Ending December 31,	Amount (1) (in thousands)
2017	$	145,075
2018	148,240
2019	144,379
2020	141,010
2021	141,654
Thereafter	337,745
Total	$	1,058,103

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⁽¹⁾  During the third quarter of 2015, the Company closed its office in Tulsa, Oklahoma. These amounts include lease payments for the Tulsa office, net of sublease income. The Company expects to receive $2.7 million of total sublease income through 2019.