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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Dividend Declaration. On January 16, 2018, we announced that our Board of Directors declared a quarterly cash dividend of $0.55 per common share, or approximately $9.3 million (including dividend equivalents), which was paid on February 15, 2018 to stockholders of record at the close of business on January 26, 2018.