Fair Value Measurements (Summary of Financial Assets and Liabilities Accounted for at Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Successor [Member]
Assets:
Investments in marketable securities	$ 90,209
Derivatives	4,908
Total assets	95,117
Liabilities:
Derivatives	101
Successor [Member] | Level 1 [Member]
Assets:
Investments in marketable securities	2,137
Derivatives	262
Total assets	2,399
Liabilities:
Derivatives	(8)
Successor [Member] | Level 2 [Member]
Assets:
Investments in marketable securities	88,072
Total assets	88,072
Liabilities:
Derivatives	0
Successor [Member] | Level 3 [Member]
Assets:
Derivatives	4,646
Total assets	4,646
Liabilities:
Derivatives	$ 109
Predecessor [Member]
Assets:
Investments in marketable securities		$ 201,910
Derivatives		9,052
Total assets		210,962
Liabilities:
Derivatives		0
Predecessor [Member] | Level 1 [Member]
Assets:
Investments in marketable securities		11,713
Derivatives		5,597
Total assets		17,310
Predecessor [Member] | Level 2 [Member]
Assets:
Investments in marketable securities		190,197
Derivatives		1,023
Total assets		191,220
Liabilities:
Derivatives		0
Predecessor [Member] | Level 3 [Member]
Assets:
Derivatives		2,432
Total assets		2,432
Liabilities:
Derivatives		$ 0