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Summary of Significant Accounting Policies Changes in accounting principles (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other assets | $ 46,142 | $ 37,699
TOTAL ASSETS | 1,415,554 | 1,205,239
Convertible senior subordinated notes due 2017 - net | 56,518 | 55,943
Convertible senior subordinated notes due 2018 - net | 84,714 | 84,006
Senior notes - net | 294,727 | 226,099
Liabilities | 818,988 | 660,944
Accounting Standards Update 201503 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other assets |  | 37,699
TOTAL ASSETS |  | 1,205,239
Convertible senior subordinated notes due 2017 - net |  | 55,943
Convertible senior subordinated notes due 2018 - net |  | 84,006
Senior notes - net |  | 226,099
Liabilities |  | 660,944
Scenario, Previously Reported [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other assets |  | 43,870
TOTAL ASSETS |  | 1,211,410
Convertible senior subordinated notes due 2017 - net |  | 57,500
Convertible senior subordinated notes due 2018 - net |  | 86,250
Senior notes - net |  | 228,469
Liabilities |  | 667,115
Scenario, Adjustment [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Other assets | $ (7,800) | (6,171)
TOTAL ASSETS |  | (6,171)
Convertible senior subordinated notes due 2017 - net |  | (1,557)
Convertible senior subordinated notes due 2018 - net |  | (2,244)
Senior notes - net |  | (2,370)
Liabilities |  | $ (6,171)

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