Convertible Notes (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Schedule of carrying value and unamortized discount on December 2021 Notes [Table Text Block]

The carrying value and unamortized discount of the December 2021 Notes were as follows:

(In thousands)	December 31, 2016
Principal amount of the December 2021 Notes	$	150,000
Unamortized discount of liability component	(39,152		)
Net carrying value of the December 2021 Notes	$	110,848

Schedule of convertible and non-recourse notes activity

(In thousands)	Series 2012  Notes			May 2015 Notes			February 2018 Notes			December 2021 Notes			Term Loan			Total
Balance at December 31, 2014	$	22,261		$	153,235		$	269,275		$	—		$	—		$	444,771
Issuance and exchange	—			—			—			—			100,000			100,000
Payment	(22,337		)	(155,050		)	—			—			(75,000		)	(252,387		)
Repurchase	—			—			(53,553		)	—			—			(53,553		)
Non-cash Discount	—			—			—			—			(607		)	(607		)
Amortization	76			1,815			13,140			—			573			15,604
Balance at December 31, 2015	—			—			228,862			—			24,966			253,828
Issuance and exchange	—			—			—			150,000			—			150,000
Payment	—			—			—			—			(25,000		)	(25,000		)
Repurchase	—			—			(120,000		)	—			—			(120,000		)
Non-cash Discount	—			—			—			(3,204		)	—			(3,204		)
Non-cash conversion feature	—			—			—			(36,653		)	—			(36,653		)
Amortization	—			—			12,733			705			34			13,472
Balance at December 31, 2016	$	—		$	—		$	121,595		$	110,848		$	—		$	232,443

Schedule of carrying value and unamortized discount on Series 2012 Notes

Schedule of interest expense on Series 2012 Notes

	Year ended December 31,
(In thousands)	2016		2015		2014
Contractual coupon interest	$	—	$	80	$	1,726
Amortization of debt issuance costs	—		13		1,089
Amortization of debt discount	—		76		2,415
Total	$	—	$	169	$	5,230

Schedule of carrying value and unamortized discount on May 2015 Notes

Schedule of interest expense for May 2015 Notes

	Year Ended December 31,
(In thousands)	2016		2015		2014
Contractual coupon interest	$	—	$	1,938	$	5,817
Amortization of debt issuance costs	—		435		1,274
Amortization of debt discount	—		1,815		5,182
Total	$	—	$	4,188	$	12,273

Schedule of Maturities of Long-term Debt [Table Text Block]

(In thousands)	February 2018 Notes		December 2021 Notes		Total
2017	$	—	$	—	$	—
2018	126,447		—		126,447
2019	—		—		—
2020	—		—		—
2021	—		150,000		150,000
Thereafter	—		—		—
Total	$	126,447	$	150,000	$	276,447

Schedule of carrying value and unamortized discount on February 2018 Notes [Table Text Block]

The carrying value and unamortized discount of the February 2018 Notes were as follows:

(In thousands)	December 31, 2016			December 31, 2015
Principal amount of the February 2018 Notes	$	126,447		$	246,447
Unamortized discount of liability component	(4,852		)	(17,585		)
Net carrying value of the February 2018 Notes	$	121,595		$	228,862

Schedule of interest expense for February 2018 Notes [Table Text Block]

Interest expense for the February 2018 Notes on the Company’s Consolidated Statements of Income was as follows:

	Year Ended December 31,
(In thousands)	2016		2015		2014
Contractual coupon interest	$	9,338	$	11,786	$	10,633
Amortization of debt issuance costs	2,863		2,980		1,898
Amortization of debt discount	9,870		10,160		5,954
Total	$	22,071	$	24,926	$	18,485

Schedule of interest expense for December 2021 Notes [Table Text Block]

Interest expense for the December 2021 Notes on the Company’s Consolidated Statements of Income was as follows:

	Year Ended December 31,
(In thousands)	2016
Contractual coupon interest	$	447
Amortization of debt issuance costs	10
Amortization of debt discount	75
Amortization of conversion feature	620
Total	$	1,152